Vampire bats adopt orphans, and are one of the few mammals known to risk their own lives to share food with less fortunate roost-mates.
402
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
The difference between antlers and horns is that antlers are shed each year and are made of bone while horns are kept for life and are made of living tissue and bone with a sheath that is very similar to human finger nails.
10
Dolphins have names for one another.
18
It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
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