Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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When cats are happy, they may squeeze their eyes shut.
10
A zoo in China gave a gay penguin couple the opportunity to raise a chick.
11
Meysi is one of the world's smallest dogs, measuring in at just 7cm tall, 12cm long, and weighing a meagre 250 grams (only slightly heavier than a hamster!)
11
Baks the blind boxer has a seeing eye goose named Buttons; a four-year-old goose who leads the pup around everywhere either by hanging onto him with her neck, or by honking to tell him which way to go.
16
One litter of kittens can be produced by more than one father.
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