Antifreeze for animals

Cars have antifreeze in their radiator to prevent the coolant from freezing in winter. But what about animals? What prevent their fluids from freezing in winter?

Well the reindeer eat lots of moss because the moss contain a special chemical that keep their fluids from freezing much as antifreeze keeps a car from freezing up in winder.

Some Artic and Antartic animals have evolved proteins in their blood which stop it from freezing solid. Some animals also build up high concentrations of sugars or sugar alcohols in their tissues.