The colossal squid has the largest eyes in the world.
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The head of a jellyfish is called the "Bell."
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Ants have tiny magnetic compasses in their antennae which help them navigate.
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The seahorse is the only fish to have a neck.
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When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
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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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There's a young hippo and a 130+ year old tortoise in a Kenyan wildlife preserve who are best friends and they even sleep and play together.
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In 1918, a homing pigeon saved over 190 American soldiers by delivering a message to nearby support despite having been shot through the breast, blinded in one eye, covered in blood, and with a leg hanging on by just a tendon.
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