![]() In North America, a species of wood frog can survive being frozen and thawed a few times a season thanks to a unique natural substance in their blood.Ĩ. Reptiles like snakes and lizards often find an unused burrow and settle in to wait out the cold because they are cold‐blooded (their body temperature is controlled by the environment). Aestivation usually lasts for a shorter period than hibernation.Ħ. This is when they find a cool, safe spot and become inactive. In hot, dry climates, creatures like the African hedgehog and crocodiles ‘aestivate’. Then in winter, they sleep for up to 20 hours a day, heading out in the early morning or late afternoon to snack on their hoards.ĥ. During summer, they stash food in different locations. Squirrels don’t hibernate because they can’t build up enough body fat. Animals hibernate in lots of different ways – from snails, who attach themselves to a surface, cover themselves with their slime, and wait out winter, to hedgehogs, who like to build nests out of grass, leaves and straw, often under fallen logs.Ĥ. Just as well, because they can lose up to half their body weight during hibernation.ģ. Dormice, for example, eat so much that by the end of summer, they can be double their normal size. To prepare for a long hibernation in which they don’t eat or drink, animals stuff their faces. During hibernation their heart rates and breathing slow down, and their body temperature drops.Ģ. When the weather is cold and food is in short supply, animals like hedgehogs, bears and bats become inactive to save energy. ![]() When animals hibernate, they aren’t sleeping. ![]() Animals that hibernate seem to have the right idea: Find a cosy burrow, head indoors, and catch some Zzz’s until spring returns. ![]()
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