Ants make up 1/10 of the total world animal tissue. The total biomass of all the ants on Earth is about equal to the total biomass of all the people.
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Hummingbirds can't walk.
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The elephant is one of the few mammals that can't jump!
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Frogs sometimes eat enough fireflies that they themselves glow.
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Crocodiles swallow stones to help them dive deeper.
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Some older/less efficient worker termites will develop 'backpacks' of toxic chemicals that explode when the termite is threatened. They are essentially used as suicide bombers when the colony is being attacked.
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