A killer whale's heart beats 30 times a minute under water, 60 times a minute on the surface.
30
Cats and dogs can hear ultrasound.
350
The male platypus has poisonous spurs on its legs.
58
When you correct for weight differences, men are proportionately stronger than horses.
64
The venom of the king cobra is so deadly that just one gram of it can kill 150 people.
76
The average housefly lives only two weeks.
39
Cats recognise the voice of their owner, but never evolved to care.
22
Sea otters hold hands while sleeping so they don’t drift away from each other.
104