something special about polar bears

By: Guest
Date: Fri-Jun-5-2009-
Polar bears are superbly insulated by up to 10 cm (3.9 in) of blubber,[34] their hide and their fur; they overheat at temperatures above 10 C (50 F), and are nearly invisible under infrared photography.[38] Polar bear fur consists of a layer of dense underfur and an outer layer of guard hairs, which appear white to tan but are actually transparent.[34] The guard hair is 515 cm (2.05.9 in) over most of the body.[39] Polar bears gradually moult from May to August,[40] but, unlike other Arctic mammals, they do not shed their coat for a darker shade to camouflage themselves in the summer conditions
[d] By: Guest
Date: Sun-Oct-4-2009
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