The lifespan of mammals is about 1 and a half billion heartbeats.
127
The male praying mantis cannot copulate while its head is attached to its body. The female initiates sex by ripping the males head off.
85
A blue whale's heart is the size of a Volkswagen Beetle!
37
Some ribbon worms will eat themselves if they can't find any food.
-33
Camels have three eyelids to protect themselves from blowing sand!
30
Only male fireflies can fly.
46
An eagle can attack, kill, and carry away an animal as large as a small deer.
38