Cows can sleep standing up, but they can only dream lying down.
745
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
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
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
Two dogs were among the Titanic survivors.
262
A puppy is born blind, deaf, and toothless.
16
An average cat has 1-8 kittens per litter and can have 2-3 litters per year. During her productive life, one female cat could have more than 100 kittens. A single pair of cats and their kittens can produce as many as 420,000 kittens in just 7 years.
10
Cats recognise the voice of their owner, but never evolved to care.
22