Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
10
Sloths take two weeks to digest their food.
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Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
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The male seahorse carries babies and 'gives birth' to them instead of the female.
7
Cats recognise the voice of their owner, but never evolved to care.
22