Some animals hibernate, living on stored fat until the warm weather returns. During hibernation, their metabolisms drop so that they need fewer calories to live. Some animals migrate, moving to warmer climates where food is available. Some insects die but leave eggs that will hatch in the spring. Some animals stay active and work harder to find food.
Herbivores search for dried grass under the snow.
Predators travel greater distances or hunt for longer hours. The cold weather makes them burn more calories to keep warm. During hard winters, some animals starve to death. More Information . Elizabeth Anne Viau.