Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
In 2011, a male tiger in India adopted a litter of orphaned cubs, taking on the role of ‘mother’. Wildlife officials say such behavior had never been observed before.
9
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
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Unsinkable Sam (nickname of a German ship's cat) who served on 3 warships, one German, two British, all sank in action. The cat survived each sinking, floating away on wooden planks to rescue.
19
Cats recognise the voice of their owner, but never evolved to care.
22
In Australia, there are spiders big enough to eat snakes.
20