Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
The seahorse is the only fish to have a neck.
12
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
Only 3% of bird species have penises.
0
The largest breed of rabbit is the Flemish Giant.
65
In 1955, the citizens of São Paulo were so upset with their government that they elected a rhinoceros named Cacareco (meaning rubbish) to the city council in protest, with over 100,000 votes.
18