A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
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
The elephant shrew’s closest relative isn’t a shrew — it’s actually an elephant
9
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
Mahatma Gandhi used to travel with his goat so that he could have fresh milk.
11