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Narrow-skulled Pocket Mouse
The narrow-skulled pocket mouse (''Chaetodipus artus'') is a species of rodent in the family Heteromyidae. It is endemic to western Mexico, living west of the Sierra Madre Occidental crest. Description The narrow-skulled pocket mouse is a medium-sized species growing to a length of about including a tail of about . Males are slightly larger than females. The skull is smaller and narrower than that of Goldman's pocket mouse (''Chaetodipus goldmani'') which is native to the same parts of Mexico. Apart from the skull, other features which distinguish it from Goldman's pocket mouse include a less hairy but more scaly tail with a wider dorsal stripe, a smaller total length, darker ears and darker, less-grizzled dorsal fur. In the drainage of the Rio Septentrion this species has a darker coat than elsewhere. The reason for this may lie in the fact that the soil is darker in this area and pale individuals are more easily spotted by diurnal predators. It feeds on seeds. Distribution a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilfred Hudson Osgood
Wilfred Hudson Osgood (December 8, 1875 – June 20, 1947) was an American zoologist. Biography Osgood was born in Rochester, New Hampshire, the oldest child of a family of watchmakers. The family moved to California in 1888 and he went to study in Santa Clara, California, Santa Clara and San Jose, California, San Jose. He joined in the activities of the Cooper Ornithological Club and found company in wikisource:Author:Chester Barlow, Chester Barlow and Rollo Beck, Rollo H. Beck. He taught at a school in Arizona for a year and then moved to the newly formed Stanford University, where he came to meet Charles Henry Gilbert, Charles H. Gilbert and David Starr Jordan. He joined the staff of the Bureau of Economic Ornithology and Mammalogy, of the United States Department of Agriculture at the age of 22. This group later became the Bureau of Biological Survey under Clinton Hart Merriam. In 1909 he moved to the Field Museum of Natural History in Chicago, where he was assistant curator o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Painted Spiny Pocket Mouse
The painted spiny pocket mouse (''Heteromys pictus'') is a species of rodent in the family Heteromyidae. It is found in Mexico and the northern tip of Guatemala. It was formerly placed in the genus ''Liomys'', which is now recognized to be paraphyletic and has been subsumed into ''Heteromys''. Description The painted spiny pocket mouse is a medium-sized species and grows to a head and body length of about with a tail as long again, males being slightly larger than females. The pelage is composed of a mixture of stiff spines with soft, slender hairs, but because the hairs do not curl upward, the spines are the prominent feature of the coat. The upper parts of the head and body are reddish-brown and the underparts are white. The lateral line that separates the dorsal and ventral colors is some shade of dark or pale ochre. Immature pocket mice are grey and their coat consists mainly of soft hairs. Distribution and habitat The painted spiny pocket mouse is found in Mexico and Guatem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endemic Mammals Of Mexico
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsewhere. For example, the Cape sugarbird is found exclusively in southwestern South Africa and is therefore said to be ''endemic'' to that particular part of the world. An endemic species can be also be referred to as an ''endemism'' or in scientific literature as an ''endemite''. For example '' Cytisus aeolicus'' is an endemite of the Italian flora. '' Adzharia renschi'' was once believed to be an endemite of the Caucasus, but it was later discovered to be a non-indigenous species from South America belonging to a different genus. The extreme opposite of an endemic species is one with a cosmopolitan distribution, having a global or widespread range. A rare alternative term for a species that is endemic is "precinctive", which applies to s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chaetodipus
''Chaetodipus'' is a genus of pocket mouse containing 17 species endemic to the United States and Mexico. Like other members of their family such as pocket mice in the genus ''Perognathus'', they are more closely related to pocket gophers than to true mice. Characteristics Members of this genus range in size from 80 to 125 mm (head and body) and weigh 15–47 grams (Nowak, 1999). Unlike the silky pocket mice (genus ''Perognathus''), most species of the genus ''Chaetodipus'' have harsh pelage with some bordering on spiny hair. They tend to be found in arid habitats where they feed on seeds, vegetation, and insects (Nowak, 1999). Females give birth to a litter of 2–9 young after a gestation period of just under a month. The longest recorded life span is 8 years and 4 months (Nowak, 1999). Species *'' Chaetodipus arenarius'' – Little desert pocket mouse *'' Chaetodipus artus'' – Narrow-skulled pocket mouse *'' Chaetodipus baileyi'' – Bailey's pocket mouse *'' Ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mammals Described In 1900
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 hair, and three middle ear bones. These characteristics distinguish them from reptiles (including birds) from which they diverged in the Carboniferous, over 300 million years ago. Around 6,400 extant species of mammals have been described divided into 29 orders. The largest orders, in terms of number of species, are the rodents, bats, and Eulipotyphla (hedgehogs, moles, shrews, and others). The next three are the Primates (including humans, apes, monkeys, and others), the Artiodactyla (cetaceans and even-toed ungulates), and the Carnivora (cats, dogs, seals, and others). In terms of cladistics, which reflects evolutionary history, mammals are the only living members of the Synapsida (synapsids); this clade, together with Sauropsida ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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. They do not qualify as threatened, near threatened, or (before 2001) conservation dependent. Species cannot be assigned the "Least Concern" category unless they have had their population status evaluated. That is, adequate information is needed to make a direct, or indirect, assessment of its risk of extinction based on its distribution or population status. Evaluation Since 2001 the category has had the abbreviation "LC", following the IUCN 2001 Categories & Criteria (version 3.1). Before 2001 "least concern" was a subcategory of the "Lower Risk" category and assigned the code "LR/lc" or lc. Around 20% of least concern taxa (3261 of 15636) in the IUCN database still use the code "LR/lc", which indicates they have not been re-evaluate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Union For Conservation Of Nature
The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natural resources. It is involved in data gathering and analysis, research, field projects, advocacy, and education. IUCN's mission is to "influence, encourage and assist societies throughout the world to conserve nature and to ensure that any use of natural resources is equitable and ecologically sustainable". Over the past decades, IUCN has widened its focus beyond conservation ecology and now incorporates issues related to sustainable development in its projects. IUCN does not itself aim to mobilize the public in support of nature conservation. It tries to influence the actions of governments, business and other stakeholders by providing information and advice and through building partnerships. The organization is best known to the wider pu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rodenticide
Rodenticides are chemicals made and sold for the purpose of killing rodents. While commonly referred to as "rat poison", rodenticides are also used to kill mice, squirrels, woodchucks, chipmunks, porcupines, nutria, beavers, and voles. Despite the crucial roles that rodents play in nature, there are times when they need to be controlled. Some rodenticides are lethal after one exposure while others require more than one. Rodents are disinclined to gorge on an unknown food (perhaps reflecting an adaptation to their inability to vomit), preferring to sample, wait and observe whether it makes them or other rats sick. This phenomenon of poison shyness is the rationale for poisons that kill only after multiple doses. Besides being directly toxic to the mammals that ingest them, including dogs, cats, and humans, many rodenticides present a secondary poisoning risk to animals that hunt or scavenge the dead corpses of rats. Classes of rodenticides Anticoagulants Anticoagulant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antelope Jackrabbit
The antelope jackrabbit (''Lepus alleni'') is a species of North American hare found in southern Arizona and northwestern Mexico that occupies dry desert areas. Behaviour It is most active during twilight ( crepuscular) and during the night ( nocturnal), but can be active during the day when conditions are favorable (heavy cloud coverage). Evolutionary history Fossil evidence places the genus ''Lepus'' in North America approximately 2.5 million years ago. A now extinct jackrabbit species, ''Lepus giganteus'', was thought to exist in North America during this time. This species shared similar physical traits with the antelope jackrabbit, making it difficult to differentiate fossils of the two species. In a 2014 study, researchers hypothesized that ''L. giganteus'' served as a common ancestor to the antelope jackrabbit and black-tailed jackrabbit. The black-tailed jackrabbit coexists with the antelope jackrabbit and the two species maintain a sympatric relationship. In the same ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cactus Mouse
The cactus mouse (''Peromyscus eremicus'') is a species of rodent in the family Cricetidae. It is a species of the genus ''Peromyscus'', a closely related group of New World mice often called "deermice" (although the term more commonly refers specifically to '' P. maniculatus''). They are native to desert areas of southwestern North America. Description Cactus mice are small cricetid rodents, with large eyes and ears, a pointed snout, and a long monocolor tail. Avarage dimensions for ''P. eremicus'' are as follows: total length, 160mm to 211mm; length of body, 72mm to 100mm; length of tail, 84mm to 120mm; length of hind foot, 18mm to 22mm; length of ear, 13.4mm to 20.0mm; greatest length of skull, 22.7mm to 25.9mm and zygomatic breadth, 11.2mm to 13.5mm. Adults weigh between . Females weigh slightly more than males and are significantly larger in body length, ear length, length of mandible, and bullar width of skull. Cactus mice can be identified by having naked soles on thei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
White-throated Woodrat
The white-throated woodrat (''Neotoma albigula'') is a species of rodent in the family Cricetidae. It is found from central Mexico north to Utah and Colorado in the United States. It is primarily a western species in the United States, extending from central Texas west to southeastern California. Populations east of the Rio Grande in New Mexico and Trans-Pecos Texas, previously considered to be variants of the white-throated woodrat, have since 1988 been assigned to the white-toothed woodrat (''Neotoma leucodon''). The animal lives mostly in the Upper and Lower Sonoran life zones, occurring from pinyon-juniper woodland in higher country to desert habitats at lower elevations. As with other species of woodrats, the white-throated woodrat constructs middens of a variety of materials such as sticks, cactus parts, and miscellaneous debris. An above-ground chamber within the midden contains a nest lined with grasses and kept free of feces. In non-rocky areas, the den usually is se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southern Grasshopper Mouse
The southern grasshopper mouse or scorpion mouse (''Onychomys torridus'') is a species of predatory rodent in the family Cricetidae, native to Mexico and the states of Arizona, California, Nevada, New Mexico, and Utah in the United States. Notable for its resistance to venom, it routinely preys on the highly venomous Arizona bark scorpion. Description The southern grasshopper mouse is a robust, small, nocturnal species that typically forms monogamous pairs. They have a short tail, growing to a total length of . The head, back and sides are pinkish- or grayish-brown while the underparts are white, the two colors being distinctly separated. The tail is club-shaped, short and broad, the anterior part being the same color as the body and the tip being white. Biology The southern grasshopper mouse feeds almost entirely on arthropods, such as beetles, grasshoppers and scorpions. In addition to arthropods, it is known to prey upon the little pocket mouse (''Perognathus longimembris'') ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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