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Tarantula hawk, American wasps with sting so painful, one peer-reviewed journal advises anyone who gets stung to lie down and scream to avoid further injury.

The Pitohui is a rare bird whose feathers and skin produce a toxin only found elsewhere on poison dart frogs. Just being in the vicinity of the bird can cause numbness to paralysis, leading to death.

Elephants are the only species of mammals other than humans to have recognized death ritual. They bury their dead and will revisit old graves.

There is a parasitic flatworm that causes frogs to grow a second set of hind legs.

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