Cats recognise the voice of their owner, but never evolved to care.
22
Early American humans hunted car-size armadillos and used their shells for houses.
12
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
Queen ants have one of the longest life-spans of any known insect - typically up to 30 years. Western harvester ant queens can live up to 40 years!
2
Dogs have been man's pet for over 14,000 years.
224