Dragonflies have six legs but cannot walk!
25
Sharks, like other fish, have their reproductive organs in their chests.
248
Spiders have transparent blood.
56
There’s a bonobo named Kanzi who has learned to build a campfire and cook his own food.
8
Human birth control pills work on gorillas.
52
Goldfish lose their color if they are kept in dim light or are placed in a body of running water, such as a stream.
12
The lifespan of mammals is about 1 and a half billion heartbeats.
127