Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
A dairy cow can produce more milk when listening to music.
446
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
A cow produces around 200,000 glasses of milk in her lifetime.
373
Penguins have a gland above their eye that turns saltwater into freshwater.
12