1. Oysters can change gender depending on which is best for mating.

2. The closest relatives to the elephant shrew are actually elephants, not shrews.

3. A cat version of the corgi exits: the munchkin cat.

4. Seahorses mate for life, and when they travel they hold each other’s’ tails.

5. Before chicks hatch, they can communicate with each other and their mother through a system of sounds.