Lancet Fish - The Little Mermaid

Lancet fish are hermaphrodites, and they can change when they meet a new one. The calagono plays dead in order to eat food - it lays down and it just plays dead. Top flight tennis rackets all used to be made of cow intestines. It took four cows to make one tennis racke; that's too many for each game. Biologists think the black swallower looks at humans as if he thinks 'i belong there'