Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Whales and dolphins can't taste anything other than salt.
11
Bats sleep 18-20 hours per day.
5
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
By putting a frog in a bucket of milk, scientists following up on an ancient Russian way of keeping milk from going sour have identified a wealth of new antibiotic substances.
9
The reindeer is the only mammal that can see UV light.
17