Collared Pika
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The collared pika (''Ochotona collaris'') is a species of
mammal Mammals () are a group of vertebrate animals constituting the class Mammalia (), characterized by the presence of mammary glands which in females produce milk for feeding (nursing) their young, a neocortex (a region of the brain), fur or ...
in the
pika A pika ( or ; archaically spelled pica) is a small, mountain-dwelling mammal found in Asia and North America. With short limbs, very round body, an even coat of fur, and no external tail, they resemble their close relative, the rabbit, but wi ...
family, Ochotonidae, and part of the order
Lagomorpha The lagomorphs are the members of the taxonomic order Lagomorpha, of which there are two living families: the Leporidae (hares and rabbits) and the Ochotonidae (pikas). The name of the order is derived from the Ancient Greek ''lagos'' (λαγ ...
, which comprises rabbits, hares, and pikas. It is a small (about 160 g) alpine
lagomorph The lagomorphs are the members of the taxonomic order Lagomorpha, of which there are two living families: the Leporidae (hares and rabbits) and the Ochotonidae (pikas). The name of the order is derived from the Ancient Greek ''lagos'' (λαγ ...
that lives in boulder fields of central and southern
Alaska Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U.S., ...
(
U.S. The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...
), and in parts of
Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...
, including northern
British Columbia British Columbia (commonly abbreviated as BC) is the westernmost province of Canada, situated between the Pacific Ocean and the Rocky Mountains. It has a diverse geography, with rugged landscapes that include rocky coastlines, sandy beaches, ...
,
Yukon Yukon (; ; formerly called Yukon Territory and also referred to as the Yukon) is the smallest and westernmost of Canada's three territories. It also is the second-least populated province or territory in Canada, with a population of 43,964 as ...
, and western parts of the
Northwest Territories The Northwest Territories (abbreviated ''NT'' or ''NWT''; french: Territoires du Nord-Ouest, formerly ''North-Western Territory'' and ''North-West Territories'' and namely shortened as ''Northwest Territory'') is a federal territory of Canada. ...
. It is closely related to the
American pika The American pika (''Ochotona princeps''), a diurnality, diurnal species of pika, is found in the mountains of western North America, usually in boulder fields at or above the tree line. They are herbivorous, smaller relatives of rabbits and ha ...
(''O. princeps''), but it is a
monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispec ...
form containing no recognized subspecies. It is
asocial Asociality refers to the lack of motivation to engage in Social relation, social interaction, or a preference for solitary activities. Asociality may be associated with avolition, but it can, moreover, be a manifestation of limited opportunities ...
, does not
hibernate Hibernation is a state of minimal activity and metabolic depression undergone by some animal species. Hibernation is a seasonal heterothermy characterized by low body-temperature, slow breathing and heart-rate, and low metabolic rate. It most ...
, and spends a large part of its time in the summer collecting vegetation that is stored under rocks ("haypiles") as a supply of food for the winter. Some individuals have been observed collecting and consuming dead birds as sources of fat and protein. Thousands of trips are made during July and August to collect vegetation for winter.


Description


Appearance

The appearance of collared pikas is similar to other members of the genus ''
Ochotona A pika ( or ; archaically spelled pica) is a small, mountain-dwelling mammal found in Asia and North America. With short limbs, very round body, an even coat of fur, and no external tail, they resemble their close relative, the rabbit, but ...
''. On the dorsal side of their bodies, they have dull grayish fur with gray patches on their shoulders and
nape The nape is the back of the neck. In technical anatomical/medical terminology, the nape is also called the nucha (from the Medieval Latin rendering of the Arabic , "spinal marrow"). The corresponding adjective is ''nuchal'', as in the term ''nu ...
creating a distinguishable collar,MacDonald, Stephen O. and Jones, Clyde. 1987. “Mammalian Species: Ochotona collaris.” https://www.jstor.org/stable/3503971 while on the ventral side they have an opaque white-colored fur.Leininger, C. 2009. "Ochotona collaris" (On-line), Animal Diversity Web. Accessed October 03, 2014 a
http://animaldiversity.ummz.umich.edu/accounts/Ochotona_collaris/
/ref> Their winter pelts are similar to ''O. princeps'', but during the other seasons, ''O. collaris fur is a darker gray and is less thick than in the winter; consequently, they only have one annual
molt In biology, moulting (British English), or molting (American English), also known as sloughing, shedding, or in many invertebrates, ecdysis, is the manner in which an animal routinely casts off a part of its body (often, but not always, an outer ...
. During the summer, young that resemble the size of an adult are fully gray, while actual adults have brown stains around their heads or necks. Some features that are helpful in identifying ''O. collaris'' from ''O. princeps'' are the creamy-colored fur over the facial gland, which is brown in ''O. princeps;'' and in addition, the skull size of ''O. collaris'' is broader with a shorter nasal area, a greater
tympanic bulla The tympanic part of the temporal bone is a curved plate of bone lying below the squamous part of the temporal bone, in front of the mastoid process, and surrounding the external part of the ear canal. It originates as a separate bone (tympanic ...
e, and different teeth
morphology Morphology, from the Greek and meaning "study of shape", may refer to: Disciplines * Morphology (archaeology), study of the shapes or forms of artifacts * Morphology (astronomy), study of the shape of astronomical objects such as nebulae, galaxies ...
than those of ''O. princeps''.


Characteristics

They are petite in size with longer hind limbs than their fore limbs, with their hind limbs being about 2.9 to 3.1 cm. They have five digits on each front foot and only four on each hind foot. The soles of their feet are covered with long fur, while still exposing their digital pads on the soles of their feet and their curved claws. They range between 130 and 200 g in body mass and 17.8 to 19.8 cm in length. For both male and females, the average weight is around 157 g, with maximum growth rates increasing moving toward the northern parts of collared pika territories. They have constricted, flat skulls with no supraorbital processes, slender
zygomatic arch In anatomy, the zygomatic arch, or cheek bone, is a part of the skull formed by the zygomatic process of the temporal bone (a bone extending forward from the side of the skull, over the opening of the ear) and the temporal process of the zygomati ...
es, and 26 teeth. While some
mammals Mammals () are a group of vertebrate animals constituting the class Mammalia (), characterized by the presence of mammary glands which in females produce milk for feeding (nursing) their young, a neocortex (a region of the brain), fur or ...
have reduced
clavicles The clavicle, or collarbone, is a slender, S-shaped long bone approximately 6 inches (15 cm) long that serves as a strut between the shoulder blade and the sternum (breastbone). There are two clavicles, one on the left and one on the right ...
for more range of motion, the collared pika has a well-developed
clavicle The clavicle, or collarbone, is a slender, S-shaped long bone approximately 6 inches (15 cm) long that serves as a strut between the shoulder blade and the sternum (breastbone). There are two clavicles, one on the left and one on the rig ...
supporting the
scapula The scapula (plural scapulae or scapulas), also known as the shoulder blade, is the bone that connects the humerus (upper arm bone) with the clavicle (collar bone). Like their connected bones, the scapulae are paired, with each scapula on eithe ...
. They do not have a
pubic symphysis The pubic symphysis is a secondary cartilaginous joint between the left and right superior rami of the pubis of the hip bones. It is in front of and below the urinary bladder. In males, the suspensory ligament of the penis attaches to the pubic ...
therefore it does not have a
pubic arch The pubic arch, also referred to as the ''ischiopubic arch'', is part of the pelvis. It is formed by the convergence of the inferior rami of the ischium and pubis on either side, below the pubic symphysis. The angle at which they converge is kno ...
within its
pelvic girdle The pelvis (plural pelves or pelvises) is the lower part of the trunk, between the abdomen and the thighs (sometimes also called pelvic region), together with its embedded skeleton (sometimes also called bony pelvis, or pelvic skeleton). The p ...
. In addition, an interesting characteristic about the male collared pika is that it has no scrotum and the location of its testes is not visibly apparent. This indicates no
sexual dimorphism Sexual dimorphism is the condition where the sexes of the same animal and/or plant species exhibit different morphological characteristics, particularly characteristics not directly involved in reproduction. The condition occurs in most ani ...
; consequently, one must examine the pseudo
cloaca In animal anatomy, a cloaca ( ), plural cloacae ( or ), is the posterior orifice that serves as the only opening for the digestive, reproductive, and urinary tracts (if present) of many vertebrate animals. All amphibians, reptiles and birds, a ...
for evidence of specific
genitalia A sex organ (or reproductive organ) is any part of an animal or plant that is involved in sexual reproduction. The reproductive organs together constitute the reproductive system. In animals, the testis in the male, and the ovary in the female, a ...
to distinguish the sex of the collared pika.


Distribution and habitat/ecology


Geographic distribution

''O. collaris'' is distributed over a wide range of terrain that encompasses the west side of the Northwest Territories, almost all of the Yukon Territory, northern
British Columbia British Columbia (commonly abbreviated as BC) is the westernmost province of Canada, situated between the Pacific Ocean and the Rocky Mountains. It has a diverse geography, with rugged landscapes that include rocky coastlines, sandy beaches, ...
, and the central and southern parts of
Alaska Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U.S., ...
. Around 60% of collared pikas are found in regions of Canada, with most of them being in Yukon.Kukka, Piia M., McCulley, Alice, Suitor, Mike, Eckert, Cameron D. and Jung, Thomas S.. 2014. “COLLARED PIKA (OCHOTONA COLLARIS) OCCUPANCY IN TOMBSTONE TERRITORIAL PARK, YUKON.” http://www.env.gov.yk.ca/publications-maps/documents/PikaSurveyReport2013.pdf More specifically, in Alaska, they occur most frequently in ranges around the Yukon-Tanana uplands and
Chigmit Mountains The Chigmit Mountains are a subrange of the Aleutian Range in the Kenai Peninsula and Lake and Peninsula Boroughs of the U.S. state of Alaska. Location They are located at the northeastern end of the Aleutian range, on the west side of Cook Inl ...
, to the head of
Lynn Canal Lynn Canal is an inlet (not an artificial canal) into the mainland of southeast Alaska. Lynn Canal runs about from the inlets of the Chilkat River south to Chatham Strait and Stephens Passage. At over in depth, Lynn Canal is the deepest fjord ...
near
Skagway The Municipality and Borough of Skagway is a first-class borough in Alaska on the Alaska Panhandle. As of the 2020 census, the population was 1,240, up from 968 in 2010. The population doubles in the summer tourist season in order to deal with ...
; in Canada, they occur from
Richardson Mountains The Richardson Mountains are a mountain range located west of the mouth of the Mackenzie River in northern Yukon, Canada. They parallel the northernmost part of the boundary between Yukon and Northwest Territories. Although some sources conside ...
, south into northwestern British Columbia and west close to the Mackenzie River of the
Northwest Territories The Northwest Territories (abbreviated ''NT'' or ''NWT''; french: Territoires du Nord-Ouest, formerly ''North-Western Territory'' and ''North-West Territories'' and namely shortened as ''Northwest Territory'') is a federal territory of Canada. ...
. Of the 30 existing species of pika, only two inhabit North America, ''O. collaris'' and ''O. princeps''. In relation to the location of distribution of the American pika, ''O. collaris'' is located farther north of those regions and is separated by 800 km. This gap occurs in both British Columbia and Alberta, Canada.


Fossil history

In 1973, within the
Pleistocene The Pleistocene ( , often referred to as the ''Ice age'') is the geological Epoch (geology), epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was fina ...
deposits in central Alaska, preserved specimens of collared pika were found along with some dung pellets; the Yukon territory also contained some early fossilized specimens. The studies of the size variation of the fossils showed that the
morphology Morphology, from the Greek and meaning "study of shape", may refer to: Disciplines * Morphology (archaeology), study of the shapes or forms of artifacts * Morphology (astronomy), study of the shape of astronomical objects such as nebulae, galaxies ...
of Pleistocene pikas was flexible with the alteration of environments from early to middle Pleistocene in both Alaska and Yukon. During the isolation of the
Wisconsin glaciation The Wisconsin Glacial Episode, also called the Wisconsin glaciation, was the most recent glacial period of the North American ice sheet complex. This advance included the Cordilleran Ice Sheet, which nucleated in the northern North American Cor ...
, ''O. collaris'' may have become its own species separate from ''O. princeps.''


Habitat and ecology

Collared pika colonies are mainly found in the mountain regions and they typically inhabit rock slides near areas of vegetation and fields of meadows. Due to these talus sites, the species’ range distribution is broken into several condensed areas. Their homes have a range of about 30 m in diameter with caches and dens distancing from 30 to 70 m. The way organisms respond to climate change can be a distinct and peculiar characteristic, so patterns between closely related species, such as the collared pika and the American pika, are important. Collared pikas, like most other pikas, choose to live around rock slides to use the rocks as protection against the high temperatures they must endure throughout the day; they are referred to as cold-adapted
lagomorphs The lagomorphs are the members of the taxonomic order Lagomorpha, of which there are two living families: the Leporidae ( hares and rabbits) and the Ochotonidae (pikas). The name of the order is derived from the Ancient Greek ''lagos'' (λα ...
.


Behavior

Collared pikas are diurnal herbivores and spend time foraging through vegetation during the summer. This species is known as an
ecotone An ecotone is a transition area between two biological communities, where two communities meet and integrate. It may be narrow or wide, and it may be local (the zone between a field and forest) or regional (the transition between forest and gras ...
species for the way that it keeps its shelter and food storage separate from each other. This process of gathering and foraging for vegetation to add to their caches is referred to as “haying”, which is what they spend most of the day doing. They spend no time burrowing because they use their talus sites for protection and habitation. They are most active during the morning and late afternoon. Each individual within this species preserves its own territory and its own vegetation cache or haypile, and defends it with full force. Therefore, the collared pika is seen as an
asocial Asociality refers to the lack of motivation to engage in Social relation, social interaction, or a preference for solitary activities. Asociality may be associated with avolition, but it can, moreover, be a manifestation of limited opportunities ...
species and prefers solitude. During the cold winters, the collared pika does not
hibernate Hibernation is a state of minimal activity and metabolic depression undergone by some animal species. Hibernation is a seasonal heterothermy characterized by low body-temperature, slow breathing and heart-rate, and low metabolic rate. It most ...
, but instead stays active, counting on its food sources for energy and survival, and uses the snowpack as a means of
insulation Insulation may refer to: Thermal * Thermal insulation, use of materials to reduce rates of heat transfer ** List of insulation materials ** Building insulation, thermal insulation added to buildings for comfort and energy efficiency *** Insulated ...
. The distance in which the collared pika ventures out to forage is highly dependent on level of
predation Predation is a biological interaction where one organism, the predator, kills and eats another organism, its prey. It is one of a family of common feeding behaviours that includes parasitism and micropredation (which usually do not kill the ...
risk.Morrison, Shawn, Barton, Luc, Caputra, Peter, Hik, David S.. 2004. “Forage selection by collared pikas, Ochotona collaris, under varying degrees of predation risk.” http://www.nrcresearchpress.com/doi/abs/10.1139/z04-024#.VDKy1SldX1s When gathering food, pika rarely travels more than 10 m away from its talus site. Gathering begins to take place around the end of June or beginning of July and increases at a constant rate as time progresses. Collared pikas tend to have multiple haystacks of vegetation throughout their home range and often dwell in the same site annually. However, although it has multiple haystacks, it mainly focuses on one while the others are much smaller and localized caches. As observed, collared pikas are likely to use whatever is near the rockslides, such as leaves, flowering plants, berries, or anything else they can find to add to their food caches; even feces of other animals have been found within the haystacks of collared pikas. The food caches have been seen to be similar to the size of location of storage. This species is often
kleptoparasitic Kleptoparasitism (etymologically, parasitism by theft) is a form of feeding in which one animal deliberately takes food from another. The strategy is evolutionarily stable when stealing is less costly than direct feeding, which can mean when foo ...
and takes food from others. During their rest periods, collared pikas have been found to sit on rocks and expose themselves to the sunlight.Kays, Roland W., Wilson, Don E.. “ 2009. Mammals of North America: (Second Edition).” Princeton University Press. (Pg. 36) https://books.google.com/books?id=YjIIRZwbWIEC&printsec=copyright&source=gbs_pub_info_r#v=onepage&q&f=false


Reproduction

Collared pikas generally mate with their nearest neighbors and are believed to be facultatively
monogamous Monogamy ( ) is a form of Dyad (sociology), dyadic Intimate relationship, relationship in which an individual has only one Significant other, partner during their lifetime. Alternately, only one partner at any one time (Monogamy#Serial monogamy, ...
, but they have also been predicted to participate in
polygynandry Polygynandry is a mating system in which both males and females have multiple mating partners during a breeding season. In sexually reproducing diploid animals, different mating strategies are employed by males and females, because the cost of game ...
and reproduce with multiple partners, because males often travel to territories of several females during the spring before mating season begins. The males receive the females around the end of spring. However, the pinnacle of the mating season arises in May and early June. Collared pikas, both male and female, are reproductively developed at one year of age and give birth to two or three young each year in their nests within the talus. They typically produce one litter per year, but may produce two litters without successful
weaning Weaning is the process of gradually introducing an infant human or another mammal to what will be its adult diet while withdrawing the supply of its mother's milk. The process takes place only in mammals, as only mammals produce milk. The infan ...
. Although both can reproduce at one year of age, the male’s reproductive success is reliant on acquiring habitat and drawing females. The female is the one that yields the most parental investment and is burdened by energetic constraints during
gestation Gestation is the period of development during the carrying of an embryo, and later fetus, inside viviparous animals (the embryo develops within the parent). It is typical for mammals, but also occurs for some non-mammals. Mammals during pregna ...
and
lactation Lactation describes the secretion of milk from the mammary glands and the period of time that a mother lactates to feed her young. The process naturally occurs with all sexually mature female mammals, although it may predate mammals. The proces ...
.
Sexual dimorphism Sexual dimorphism is the condition where the sexes of the same animal and/or plant species exhibit different morphological characteristics, particularly characteristics not directly involved in reproduction. The condition occurs in most ani ...
makes perceiving how much the male invests in nurturing the young difficult. The female’s
gestation Gestation is the period of development during the carrying of an embryo, and later fetus, inside viviparous animals (the embryo develops within the parent). It is typical for mammals, but also occurs for some non-mammals. Mammals during pregna ...
period lasts about 30 days and produces a litter of blind and almost hairless
offspring In biology, offspring are the young creation of living organisms, produced either by a single organism or, in the case of sexual reproduction, two organisms. Collective offspring may be known as a brood or progeny in a more general way. This ca ...
. The young remain in the nest around 30 days before they are
weaned Weaning is the process of gradually introducing an infant human or another mammal to what will be its adult diet while withdrawing the supply of its mother's milk. The process takes place only in mammals, as only mammals produce milk. The infan ...
and emerge to the surface. Juveniles remain on the natal territory for only a short time (a few days) before they become independent and disperse to find their own territories. Juvenile pikas can achieve the size of an adult around 40 to 50 days.
Parturition Birth is the act or process of bearing or bringing forth offspring, also referred to in technical contexts as parturition. In mammals, the process is initiated by hormones which cause the muscular walls of the uterus to contract, expelling the f ...
timing for northern alpine herbivores is vital due to the brief snow-free timeframe and lack of food sources. The
parturition Birth is the act or process of bearing or bringing forth offspring, also referred to in technical contexts as parturition. In mammals, the process is initiated by hormones which cause the muscular walls of the uterus to contract, expelling the f ...
time of most collared pikas is often
synchronous Synchronization is the coordination of events to operate a system in unison. For example, the conductor of an orchestra keeps the orchestra synchronized or ''in time''. Systems that operate with all parts in synchrony are said to be synchronou ...
in terms of breeding, however there has been a study that has identified some correlation between variation in initiating the first litter and the variation of timing of the snowmelt. Upon finding some asynchronous breeding among pikas, due to not being able to predict snowmelt, this type of breeding could ensure some success in breeding.


Communication

Collared pikas are a fairly vocal species. Not much is known about the vocalization of collared pikas, but many studies on the American pika indicate a function of both a defensive mechanism and a warning signal against predators. As a collared pika prepares to call, it sits with a hunched back and points its nose upward. Collared pika calls sound like a recurring single sharp note with each series varying in loudness and is similar to the American pika’s short call. When interacting on a territory, collared pikas use a softer call than their normal vocalizations. Both males and females can emit vocalizations from some sort of fixed position within their home ranges, especially during the period of gathering. This territorial call informs neighboring collared pikas of haypile possession. Adult males specifically have their own call that sounds like a strong series of “kie” calls and clicking during mating season.


Population and conservation status

The estimated
population density Population density (in agriculture: standing stock or plant density) is a measurement of population per unit land area. It is mostly applied to humans, but sometimes to other living organisms too. It is a key geographical term.Matt RosenberPopul ...
is roughly around 6.4 to 7.2 individuals per hectare. In various regions of the Yukon, the range is around one to four pikas per hectare. Both collared pikas and American pikas are commonly believed to be
philopatric Philopatry is the tendency of an organism to stay in or habitually return to a particular area. The causes of philopatry are numerous, but natal philopatry, where animals return to their birthplace to breed, may be the most common. The term derives ...
species. In addition, research data have shown that young collared pikas rarely disperse over 300 m away from their original den, and adults hardly ever leave an established territory. No population trend is known, but the population of collared pikas has experienced a decline since 1995 in the Yukon area, and is proposed to have a higher probability of extinction within that specific area in 10 to 15 years. Due to collared pikas being a cold-adapted species, their resilience to climate change is limited, so they have a high risk of
extirpation Local extinction, also known as extirpation, refers to a species (or other taxon) of plant or animal that ceases to exist in a chosen geographic area of study, though it still exists elsewhere. Local extinctions are contrasted with global extinct ...
of any populations found at lower altitudes and lower in latitude. Consequently, collared pikas have been recognized as an
indicator species A bioindicator is any species (an indicator species) or group of species whose function, population, or status can reveal the qualitative status of the environment. The most common indicator species are animals. For example, copepods and other sma ...
for the effect of climate change on alpine
ecosystems An ecosystem (or ecological system) consists of all the organisms and the physical environment with which they interact. These biotic and abiotic components are linked together through nutrient cycles and energy flows. Energy enters the syste ...
.


Lifespan

The lifespan of ''O. collaris'' can be up to 7 years in the wild. The mortality rate is high during winter and they have suffered from a continuous reduction of population over time. The struggle to survive the winters and the fast-rate climate variations have affected their growing season and availability of resources, especially from the negative impact of not having snowpacks to keep them insulated or to keep their food and shelters hidden from
predator Predation is a biological interaction where one organism, the predator, kills and eats another organism, its prey. It is one of a family of common feeding behaviours that includes parasitism and micropredation (which usually do not kill th ...
s.


Predation

Collared pikas are defenseless against predators and can only hide within cracks or crevices in the mountainous areas where they live; the rocks of the terrain are their only shelter. One of the main predators of the collared pika found in south-central Alaska is the
stoat The stoat (''Mustela erminea''), also known as the Eurasian ermine, Beringian ermine and ermine, is a mustelid native to Eurasia and the northern portions of North America. Because of its wide circumpolar distribution, it is listed as Least Conc ...
, but martens, weasels, foxes, eagles, coyotes, and various birds also contribute to predation. Collared pikas have also been found to be the victims of
parasitism Parasitism is a Symbiosis, close relationship between species, where one organism, the parasite, lives on or inside another organism, the Host (biology), host, causing it some harm, and is Adaptation, adapted structurally to this way of lif ...
by fleas and parasitic
helminthes Parasitic worms, also known as helminths, are large macroparasites; adults can generally be seen with the naked eye. Many are intestinal worms that are soil-transmitted and infect the gastrointestinal tract. Other parasitic worms such as schi ...
, including some species of ''
Sarcocystis ''Sarcocystis'' is a genus of protozoan parasites, with many species infecting mammals, reptiles and birds. Its name is dervived from Greek ''sarx'' = flesh and ''kystis'' = bladder. The lifecycle of a typical member of this genus involves two ...
'', which have been found in their striated muscles.


Conservation risk

''O. collaris'' has been classified as of
least concern A least-concern species is a species that has been categorized by the International Union for Conservation of Nature (IUCN) as evaluated as not being a focus of species conservation because the specific species is still plentiful in the wild. T ...
for conservation status according to the
IUCN Red List of Threatened Species The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is the world's most comprehensive inventory of the global conservation status of biologi ...
, yet as said by the Status of Endangered Wildlife in Canada, as a result of collared pikas inhabiting areas with fast climate changes and their sensitivity to climatic variation, they are considered of special concern. Currently, no actions are being taken to preserve this species, and no threats have been acknowledged against this species. Nevertheless, the collared pika may be susceptible to the negative effects of climate change, and some investigation should be instigated to monitor the negative effects of the new unlimited, year-round hunting rules that allow for the hunting of collared pikas.


References

{{Taxonbar, from=Q185540 Pikas Mammals of North America Mammals described in 1893 Taxa named by Edward William Nelson