A banana slug can be 6-8 inches and their erect penis can be just as long. Also, their penises emerge from their heads. After sex, banana slugs eat each others penises.
17
Female kangaroos have three vaginas.
2
The ancestor of all domestic cats is the African Wild Cat which still exists today.
12
Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23