Southern short-tailed shrew
|Southern short-tailed shrew|
|Southern short-tailed shrew range|
Blarina brevicauda carolinensis
The southern short-tailed shrew is the smallest shrew in its genus, measuring 7 to 10 cm (2.8 to 3.9 in) in total length, and weighing less than 14 g (0.49 oz). It has a relatively heavy body, with short limbs and a thick neck, a long, pointed snout and ears that are nearly concealed by its soft, dense fur. As its name indicates, the hairy tail is relatively short, measuring 1.2 to 2.5 cm (0.47 to 0.98 in). The feet are adapted for digging, with five toes ending in sharp, curved claws. The fur is slate gray, being paler on the underparts.
Distribution and habitat
The southern short-tailed shrew is found in the southeastern United States, from southern Virginia to eastern Texas, and in the Mississippi valley as far as southern Illinois. Within this region, it is found primarily in pine forests. However, these range from dry to wet and even swampy habitats, as well as disturbed forests and abandoned agricultural land.
There are two recognised subspecies:
- B. c. carolinensis - southern Virginia to northern Florida, and west to eastern Mississippi, southern Illinois, and northeastern Texas
- B. c. minima - eastern Texas, Louisiana, and the Mississippi valley to eastern Arkansas and far western Kentucky
Biology and behavior
The southern short-tailed shrew's diet consists of insects, annelids, hypogeous fungi, slugs and snails, centipedes, and spiders. Known predators include snakes, hawks, owls, and foxes. It has been known to store snails for the winter. The saliva is venomous and is injected into the wounds of its prey by the teeth. Its venom is strong enough to kill mice, but is not lethal to humans,though it causes severe pain.
The southern short-tailed shrew is a social animal; it has been known to share its burrow systems with several individuals. The male and female live together during the prebreeding season. The burrows are built in two layers, one near the surface, and a deeper one joined below it. The burrows are often built below logs, which can be penetrated and honeycombed if the log is rotten.
The breeding season lasts from March to November, and females have two or three litters per year. The gestation period lasts from 21 to 30 days, and each litter consists of two to six young. The young are reared in nests of grasses and leaves at the end of a tunnel reaching about 30 cm (12 in) below the ground, or in rotten logs. These nests for the young are much larger than the adults' resting nests.
- Hutterer, R. (2005). Wilson, D. E.; Reeder, D. M, eds. Mammal Species of the World (3rd ed.). Johns Hopkins University Press. p. 269. ISBN 978-0-8018-8221-0. OCLC 62265494.
- Hammerson, G. (2008). "Blarina carolinensis". IUCN Red List of Threatened Species. Version 2009.2. International Union for Conservation of Nature. Retrieved 7 February 2010.
- Foust, Desirae. "Blarina carolinensis". Animal Diversity Web. University of Michigan. Retrieved 2009-06-22.
- McCay, T.S. (2001). "Blarina carolinensis". Mammalian Species: Number 673: pp. 1–7. doi:10.1644/1545-1410(2001)673<0001:BC>2.0.CO;2.
- Briese, L.A. & Smith, M.H. (1974). "Seasonal abundances and movement of nine species of small mammals". Journal of Mammalogy 55 (3): 615–629. doi:10.2307/1379550.
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