People in northern climates are familiar with flocks of birds flying south in the winter, but why do they do it, and why ...

Many mammals are true hibernators and remain dormant through the winter, but a lot of them stay active, at least to some degree.

Whether shedding leaves, flying south or hibernating, every species has its own way of dealing with winter. But as the season ...

Unlike many other mammals, grey squirrels don't need to hibernate. They have plenty of strategies for staying warm. Find out ...