When an animal hibernates, it goes into a state of sleep or minimal activity. Hibernation allows many animals to survive ...

Maybe she has the right idea, the arctic ground squirrel ... the deepest stages of hibernation. Using the magic trick of supercooling, ground squirrels avoid the North Slope's winter reality ...

Prior research has shown that the thirteen-lined ground squirrel, which lives on the North American plains ... drink for the entire time they are in hibernation, even when they stir occasionally.

Scientists say they are witnessing evolution in action in a population of North American red squirrels. The creatures are breeding earlier each year — probably because of climatic change.

Chipmunks, the smallest members of the squirrel family, aren’t around in the winter. They semi-hibernate ... degrees Fahrenheit here in North Berwick) only the red squirrels were visiting.

Dr Stan Boutin, from the University of Alberta in Edmonton, has been studying a North American red squirrel population in south-west Yukon. The squirrels, faced with increasing spring temperatures ...