A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
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
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
Emus and kangaroos cannot walk backwards.
26
A baby octopus is about the size of a flea at birth.
40