If you are feeling chilly this winter, imagine being a wild creature living outside. Or even and an animal in a country much colder than ours.
0 degrees Celsius: Water freezes. This is the average summer temperature at the North Pole.
-1 degree Celsius: Antarctic fish swim in water this cold. They have a kind of anti-freeze in their bodies which stops them freezing.
-2 degrees Celsius: Sea water freezes. The salt in sea water makes it freeze at a lower temperature than ordinary water.
-10 degrees Celsius: It may be cold above ground but mice and voles can survive under snow, where warmer air is trapped. They can eat plants and roots under their snowy blanket.
-20 degrees Celsius: This is how cold it gets in Norway in the winter. If you are outside in temperatures as cold as this water inside your nose will start to freeze.
-40 degrees Celsius: Arctic foxes survive in temperatures this low. Their thick winter coat of fur keeps them warm.
-45 degrees Celsius: If your bare skin was showing at this temperature it would freeze quickly and then burn off. Ow!
-50 degrees Celsius: If Bewick's swans stayed in the treeless bogs of Siberia, where they breed in summer, they would certainly die. Water is frozen solid, the ground is frozen solid, and plants are frozen too. No wonder they come to wetlands in our country to see out the winter here.
-56 degrees Celsius: Theu musk ox is the toughest mammal of all. Living close to the North Pole, this huge beast has a thick coat of long hairs reaching almost to the ground. There's another shorter coat of fur underneath, giving it double insulation.
-70 degrees Celsius: The male emperor penguin endures the hardest conditions of any animal. It stands on ice at the South Pole incubating an egg between it's feet for two whole months without a bite to eat!