Large ears, for instance, can radiate a lot of heat to the environment. This is an advantage in warm climates and a disadvantage in cold climates. Color-Males tend to be more colorful and have epigamic coloration, while the females are cryptic. Seasonal-Ptarmigan and snowshoe hares are brown in summer and white in winter. Ptarmigan also have heavily feathered feet in winter.
Male deer lose their antlers after the mating season.
Many birds have a winter plumage and a breeding plumage. The type of environment in which an animal lives. Often animals that are only distantly related will have very similar adaptations if they live in similar habitats and have similar life styles. Examples include the body shape of fishes and whales, and anteaters. They are not closely related at all.