When cats are happy, they may squeeze their eyes shut.
10
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
A zoo in China gave a gay penguin couple the opportunity to raise a chick.
11
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
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
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