Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
Rattlesnake mating sessions have been known to last more than 22 hours.
232
Sheep, goats, octopuses, and toads have rectangular pupils.
7
The most expensive cow in the world was sold in 2009 for $1.2 million.
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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