Ears

Hippos can close their nostrils and ears to prevent water from entering.

If you feel behind the ears of a horse and they appear to be cold, this means that the horse itself is feeling cold.

Snakes have internal ears but not external ones.

Elephants have big ears that help them stay cool.

A horse's ears can tell you a lot about how it is feeling. If its ears are forward, it is interested. If they are back, it might be angry or scared.