Young Winter Girl On Snow

Ecology
To survive the harshness of winter, many animals have developed different behavioral and morphological adaptations for overwintering:
• Migration is a common effect of winter upon animals, notably birds. However, the majority of birds do not migrate—the cardinal and European Robin, for example. Some butterflies also migrate seasonally.
• Hibernation is a state of reduced metabolic activity during the winter. Some animals "sleep" during winter and only come out when the warm weather returns; e.g., gophers, frogs, snakes, and bats.