Rattlesnake mating sessions have been known to last more than 22 hours.
232
Cats recognise the voice of their owner, but never evolved to care.
22
One in three dog owners say they have talked to their pets on the phone.
427
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Early American humans hunted car-size armadillos and used their shells for houses.
12
Dolphins have names for one another.
18