10 Amazing Ways Animals Have Adapted
Rabbits are a prime example of using their internal body temperatures and heating systems in order to remain warm and heat the blood vessels. Rabbits that live in the Arctic will use their small ears to protect and shield themselves from the cold weather.
Sometimes being too large is definitely a bad thing, especially in colder waters. Megathermy is the ability to produce heat using nothing but body mass, such as what the leatherback sea turtle does. This allows them to remain energized in cold waters.