A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Domestic pigs average a top speed of about 11 miles per hour.
182
There's a young hippo and a 130+ year old tortoise in a Kenyan wildlife preserve who are best friends and they even sleep and play together.
40
During World War 1, starving wolves amassed in such great numbers that Germans and Russians had a temporary cease fire to fight off the wolf attacks.
45