Snakes belong to the animal
class reptiles.
This group also includes crocodiles, lizards, and turtles. Reptiles
are cold-blooded animals that raise their body temperature by lying in the sun
or lower it by crawling into the shade.
Their body temperature changes to the temperature
of its surroundings. Because of this, snakes that live in colder climates must
hibernate through the winter. They will find burrows or caves and fall into a deep
sleep until the weather becomes ware enough for them. There are more than 2,900
species of snakes in the world. They live almost everywhere, in deserts, forests,
oceans, streams, and lakes. Snakes live on the ground, in trees, and in water. Snakes
cannot survive in places where the ground stays frozen year round so there are
no snakes north of the Arctic Circle or in Antarctica. Some islands, including
Ireland and New Zealand, do not have snakes at all.
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