Female kangaroos have three vaginas.
2
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456
When a drone bee mates with a queen, its ejaculation is so powerful that it can even be heard by the human ear.
5
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
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23