Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
The elephant brain weighs about 6,000g.
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Dogs sometimes fake being sick to get attention.
26
The reindeer is the only mammal that can see UV light.
17
Vampire bats adopt orphans, and are one of the few mammals known to risk their own lives to share food with less fortunate roost-mates.
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