Little Broad-nosed Bat
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The little broad-nosed bat (''Scotorepens greyii'') (pronounced skoh’-toh-rep’-enz grey’-ee-ee’) translates to "Grey’s darkness creeper". Sometimes called Grey’s broad-nosed after the third governor of South Australia, Sir John Edward Grey. It is a species of
vesper bat Vespertilionidae is a family of microbats, of the order Chiroptera, flying, insect-eating mammals variously described as the common, vesper, or simple nosed bats. The vespertilionid family is the most diverse and widely distributed of bat familie ...
, which is one of the largest and best-known family of bats. They are endemic to
Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...
, are
insectivore A robber fly eating a hoverfly An insectivore is a carnivorous animal or plant that eats insects. An alternative term is entomophage, which can also refer to the human practice of eating insects. The first vertebrate insectivores wer ...
s and have a broad range within the
mainland Mainland is defined as "relating to or forming the main part of a country or continent, not including the islands around it egardless of status under territorial jurisdiction by an entity" The term is often politically, economically and/or dem ...
, mainly in hot arid areas but also found in
tropical rainforest Tropical rainforests are rainforests that occur in areas of tropical rainforest climate in which there is no dry season – all months have an average precipitation of at least 60 mm – and may also be referred to as ''lowland equatori ...
s.


Description

''Scotorepens greyii'' individuals have a slender body shape, a broad square muzzle when viewed from above and have varied fur colouring. Fur ranges from brown to grey-brown on the back, with the base of the hairs being lighter than the tips; the belly fur is also lighter. Their forearm is small, their ears are relatively broad, and the tragus has a narrow and pointed tip. The glans penis has up to ten spines on the head, mainly in two rows. They are similar in appearance to other broad-nosed bats such as the Greater, Inland, Northern and Eastern broad-nosed bats. But most notably, they are almost impossible to differentiate in the field where their ranges overlap such as Northern Broad-nosed bats where their ranges overlap in the Kimberley.


Identification


Distribution and habitat

The range of ''Scotorepens greyii'' includes all of mainland Australia, but it is not found in the southern half of Western Australia and South Australia, Tasmania, Cape York Peninsula, most of the south eastern coast and most of Victoria. Although they have a broad range, their abundance within the range is relatively small and blurred by crossover range from similar species. They live in mostly hot arid regions but also reside in more temperate tropical areas. These areas range from dry grasslands, sandy deserts, inland rivers with redgums, monsoon forests, melaleuca forests, open forests, mixed shrubland and paperbark swamps. They are commonly caught around water.


Behaviour

Like most bats, the little broad-nosed bat is nocturnal and begins being active soon after sunset. They rely on good eyesight and echolocation to find their prey.


Diet and foraging

The little broad-nosed bat is an insectivore which feeds and drinks while in flight. They forage for prey close to tree tops, over water, open grassland and other open habitat. They are characteristically fast fliers which make abrupt darts and turns to catch prey. They eat a lot of beetles, bugs and ants. They also consume moths, termites, cockroaches, katydids, crickets, flies and lacewings. They drink while in flight and are known to be feisty; they have been observed preying on moths their own size.


Roost habits

Little broad-nosed bats are known to roost in hollows, usually in trees but they have also been found in fence posts and in the space under metal caps of telegraph poles. They will also roost in disused buildings; 20 individuals have been found roosting in one area. It is thought that ''Scotorepens greyii'' has some kind of seasonal migration or seasonal change in foraging behaviour due to extreme differences in bat numbers found at different times of the year.


Torpor

Despite its small size, the little broad-nosed bat is able to survive the extreme summer temperatures in its arid Australian environment by utilizing torpor and roost selection to conserve energy.
Torpor Torpor is a state of decreased physiological activity in an animal, usually marked by a reduced body temperature and metabolic rate. Torpor enables animals to survive periods of reduced food availability. The term "torpor" can refer to the time ...
helps the bats retain body water and reduces heat production from metabolic reactions. ''S. greyii'' minimizes energy expenditure using passive rewarming from its lethargic state. Roosting in poorly insulated dead trees allows solar radiation to rouse them instead of physical activity. Most
endotherm An endotherm (from Greek ἔνδον ''endon'' "within" and θέρμη ''thermē'' "heat") is an organism that maintains its body at a metabolically favorable temperature, largely by the use of heat released by its internal bodily functions inste ...
s perform
thermoregulation Thermoregulation is the ability of an organism to keep its body temperature within certain boundaries, even when the surrounding temperature is very different. A thermoconforming organism, by contrast, simply adopts the surrounding temperature ...
, an energetically demanding process where an organism uses metabolic processes along with physiological changes to control body temperature. Little broad-nosed bats are able to alternate between thermoregulation and thermoconformation, a process where body temperature fluctuates with ambient temperature, to save energy and delay
hyperthermia Hyperthermia, also known simply as overheating, is a condition in which an individual's body temperature is elevated beyond normal due to failed thermoregulation. The person's body produces or absorbs more heat than it dissipates. When extreme ...
.


Reproduction

''Scotorepens greyii'' has different mating behaviour depending on where the bats are located. It is thought that in more arid areas mating begins before winter in April and they give birth in October while in more temperate areas they are known to mate during winter and give birth in late spring or summer. They frequently give birth to twins and the young bats are capable for foraging within one to two months.


Conservation

They are not considered endangered or threatened. Although there are no major threats to the species they are vulnerable to loss of roost sites in tree hollows and loss of feeding grounds by forestry activities, clearing for agriculture and housing.


References

{{Taxonbar, from=Q631333 Scotorepens Taxa named by John Edward Gray Mammals described in 1842 Mammals of Queensland Taxonomy articles created by Polbot Bats of Australia