Whales and dolphins can't taste anything other than salt.
11
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Urechis unicinctus is a species of marine spoon worm that is widely referred to as the ‘penis fish’.
2
Unsinkable Sam (nickname of a German ship's cat) who served on 3 warships, one German, two British, all sank in action. The cat survived each sinking, floating away on wooden planks to rescue.
19
Sharks have been on the planet longer than trees.
14