The lifespan of mammals is about 1 and a half billion heartbeats.
127
An elephant trunk has no bone but 40,000 muscles.
24
Woodpecker scalps, porpoise teeth and giraffe tails have all been used as money.
46
The faster a kangaroo hops, the less energy it burns!
58
The heart of a mouse beats 650 times per minute!
53
The penguin is the only bird who can swim, but not fly!
90
Armadillos can get leprosy.
13
Dolphins sleep with one eye open!
52