Early American humans hunted car-size armadillos and used their shells for houses.
12
Dolphins have names for one another.
18
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Gorillas can catch human colds and other illnesses.
205
The largest earthworm on record was found in South Africa and measured 22 feet.
151
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
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