Arctic foxes have beautiful white (sometimes blue-gray) coats that act as very effective winter camouflage. The natural hues allow the animal to blend into the tundra's ubiquitous snow and ice. When the seasons change, the fox's coat turns as well, adopting a brown or gray appearance that provides cover among the summer tundra's rocks and plants.

These colorings help foxes to effectively hunt rodents, birds, and even fish. But in winter prey can be scarce on the ground. At such times, arctic foxes will follow the region's premier predator—a polar bear—to eat the leftover scraps from its kills. Foxes will also eat vegetables when they are available. Like a cat's, this fox's thick tail aids its balance. But for an arctic fox the tail (or "brush") is especially useful as warm cover in cold weather. Female arctic foxes give birth each spring to a large litter of up to 14 pups.

Luckily, these small foxes have some useful adaptations for living in the icy Arctic. Their thick fur coat keeps the fox's body at a toasty 104°F. Their long, fluffy tails act like a blanket, keeping the fox warm when it wraps the tail around its body to sleep. Their feet also have a layer of thick fur, like built-in snow boots. This helps muffle an arctic fox's footsteps, making it harder for prey to hear them. And their white coats make it difficult for predators such as wolves, polar bears, and golden eagles to spot them among the ice and snow.

When it's not trying to keep warm or avoid predators, an arctic fox is on the hunt for food. They prefer to eat small rodents called lemmings, but when times are tough they'll eat whatever they can find: insects, berries, and even the droppings of other animals. Sometimes an arctic fox will follow a polar bear on a hunting trip and eat the bear's leftovers.

If a fox can't find food, or if the weather gets really bad, it can dig a snow den and hunker down for up to two weeks. As long as a fox is warm, it can slow down its heart rate and metabolism, which helps the animal save energy so it doesn't have to eat as much. It's sort of like how bears hibernate, but for a shorter period of time. Once the animal emerges from its den, it'll try to hunt again. With food in its belly, the arctic fox has a better chance of making it through another long, dark winter.

ARCTIC FOX FAST FACTS • An arctic fox can smell a seal den a mile away. • Arctic foxes can be white, brown, or even blueish-gray. Its color depends on the time of year. • Arctic fox dens are used for generations—some are as old as 300 years. • These foxes have small ears. That reduces heat loss because less is exposed to the cold.