many animals have adapted to life in extreme heat and cold .
thing of the extremes in egypt . there are burning deserts and there are the high mountains of sinai which are sometimes covered with snow . now thing of the north pole with its enormous glaciers and freezing water .thing of the rainforests of south america and asia with their heavy rain . these environments are home to many types of wildlife .
one of the animals best adapted to heat is egypt's sand cats . it is not much bigger than city cats . but it is designed for desert life . with thick fur on its feet to protect it from the heat .
sand cats are not often seen because they sleep underground during the day and only come out to hunt at night . like many other desert animals they do not have to find water as they get all the moisture they need from their prey which includes rats and mice .
at the other extreme polar bears live on the ice around the north pole . they are between 2.5 and 4.5 metres long and more than 450 kilograms in weight . their white fur and thick skin protect them from the extreme cold . they live on fish which they catch through holes in the ice . they have an incredible sense of smell and can smell their prey as far as 16 kilometres away . they can run faster than 50 kilometres an hour .
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