Urechis unicinctus is a species of marine spoon worm that is widely referred to as the ‘penis fish’.
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Only 3% of bird species have penises.
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If a vampire bat goes 2 days without drinking blood, they can die. However, well fed female bats will puke up blood and share it with other bats that they like in exchange for grooming.
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Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
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The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
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Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
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