One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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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
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
When a drone bee mates with a queen, its ejaculation is so powerful that it can even be heard by the human ear.
5
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