Ecological reckoning and activity

Ecological reckoning and activity

The snowshoe hare, and some other animals, change color in winter.
Ecological reckoning of winter differs from calendar-based by avoiding the use of fixed dates. It is one of six seasons recognized by most ecologists who customarily use the term hibernal for this period of the year (the other ecological seasons being prevernal, vernal, estival, serotinal, and autumnal).[26] The hibernal season coincides with the main period of biological dormancy each year whose dates vary according to local and regional climates in temperate zones of the Earth. The appearance of flowering plants like the crocus can mark the change from ecological winter to the prevernal season as early as late January in mild temperate climates.

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.
Some animals store food for the winter and live on it instead of hibernating completely. This is the case for squirrels, beavers, skunks, badgers, and raccoons.