Thursday, September 22, 2011

Armadillo

Armadillos are New World placental mammals, known for having a leathery armor shell. Dasypodidae is the only surviving family in the order Cingulata, part of the superorder Xenarthra along with the anteaters and sloths. Their average length is about 75 centimetres (30 in), including tail; the Giant Armadillo grows up to 150 centimetres (59 in) and weighs up to 59 kilograms (130 lb), while the Pink Fairy Armadillos are diminutive species with an overall length of 12 to 15 centimetres (5 to 6 in). Many species are endangered. Some species groups, such as the long-nosed armadillos, are widely distributed over the Americas, whereas others, such as the fairy armadillos, are concentrated in smaller ranges in South America. One species, the nine-banded Armadillo (Dasypus novemcinctus), is found in the United States, primarily in the south central states (notably Texas), but with a range that extends as far east as South Carolina and Florida
The Nine-banded Armadillo prefers to build burrows in moist soil near the creeks, streams, and arroyos around which it lives and feeds. The diet of different armadillo species varies, but consists mainly of insects, grubs, and other invertebrates. Some species, however, feed almost entirely on ants and termites.

In common with other xenarthrans, armadillos in general have low body temperatures (33–36 °C) and basal metabolic rates (from 40–60% of that expected in a placental mammal of their mass). The North American Nine-banded Armadillo tends to jump straight in the air when surprised, and consequently often collides with the undercarriage or fenders of passing vehicles.

Armadillos have short legs but can move quite quickly, and have the ability to remain underwater for as long as six minutes. Because of the density of its armor, an armadillo will sink in water unless it inflates its stomach and intestines with air, which often doubles its size and allows it to swim across narrow bodies of water. They are particularly susceptible due to their unusually low body temperature, which is hospitable to the leprosy bacterium, Mycobacterium leprae. (The leprosy bacterium is difficult to culture and armadillos have a body temperature of 34 °C, similar to human skin.) Humans can acquire a leprosy infection from armadillos by handling them or consuming armadillo meat, and are a presumed vector and natural reservoir for the disease in Texas and Louisiana. Armadillos (mainly Dasypus) make common roadkill due to their habit of jumping to about fender height when startled (such as by an oncoming car). Wildlife enthusiasts are using the northward march of the armadillo as an opportunity to educate others about the animals, which can be a burrowing nuisance to property owners and managers.

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