NBC News went to Zoo Atlanta, where the goats served as evidence of the frigid conditions the last couple days.

Migration, hibernation and food storage are all responses to seasonal changes. As the days become shorter and the nights get longer, hormone changes trigger an animal's instinct to prepare for winter.

FORT WAYNE, Ind. (WANE) – While many animals, and some humans, want to avoid the cold of winter, some animals at the Fort Wayne Children’s Zoo love the winter months. In fact, they have adaptations ...

When the temperature drops, how do Britain’s birds, beasts and plants keep the cold at bay? John Lewis-Stempel reveals Nature ...