The octopus does not have a blind spot.
273
Dolphins have names for one another.
18
Sheep, goats, octopuses, and toads have rectangular pupils.
7
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Sharks have been on the planet longer than trees.
14
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