A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
When the "Elephant Whisperer" Lawrence Anthony died, a whole herd of elephants arrived at his house to mourn him.
25
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 oldest recorded elephant lived for 82 years.
213
Lobsters have blue blood.
476
Cows can sleep standing up, but they can only dream lying down.
745