Hunkering down in January; hiking boots for outdoor adventures; and cold-weather beauty essentials ...

Bears have evolved to enter a lighter state of dormancy than typical hibernation so they can quickly wake up to respond to threats.

The concept of human hibernation was firmly rooted in fiction for a considerable amount of time. That stance is starting to change. Researchers lookin.

When birds sit quietly on a branch for long periods during winter, they are not usually sleeping but conserving energy, ...