Only 3% of bird species have penises.
0
Sharks, like other fish, have their reproductive organs in their chests.
248
When cats are happy, they may squeeze their eyes shut.
10
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Queen ants have one of the longest life-spans of any known insect - typically up to 30 years. Western harvester ant queens can live up to 40 years!
2
Sharks have been on the planet longer than trees.
14