Dolphins have names for one another.
18
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255
Squirrels forget where they hide about half of their nuts.
698
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
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