Do All Animals Hibernate During Winter?

Do All Animals Hibernate During Winter? Do all animals hibernate during winter? What Kinds of Animals Hibernate? One bird and a variety of amphibians, reptiles, and insects also exhibit hibernation-like states. There is even at least one fish—the Antarctic cod (Dissostichus mawsoni)—that slows down its metabolism in winter, becoming 1/20 less active. And, of course,