The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
2
A giraffe's kick is so powerful that it can decapitate a lion.
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Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
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
Ants have tiny magnetic compasses in their antennae which help them navigate.
9
A 42-foot sperm whale has about 7 tons of oil in it.
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