Alligator snapping turtles can live for over 150 years. Scientists know this because some of the turtles had musket balls in their stomachs.
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When cats are happy, they may squeeze their eyes shut.
10
Lobsters have blue blood.
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Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Dolphins have names for one another.
18
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20