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TIL nudibranchs (sea slugs) can steal the sting of their prey. They do this my eating the tentacles of a jellyfish for example and storing the stinging cells for later use.

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oRWkW TIL Red-Eyed Tree Frogs use “Flash Coloration” which describes when an organism displays certain colors at rest versus in motion. When the frog is startled, it can flash its bright red eyes, orange webbed feet, and blue/yellow lateral stripes, which startles predators and allows the frog to escape.
LPl9 TIL that the plural of octopus is ‘octopuses’ or 'octopodes.’ The word 'octopi’ is actually incorrect.
rN96M Today I learned that the statue of David by Michelangelo is 5.17-metre (17 ft) tall.
NX5Ve TIL Why do sailors use knots as a unit of speed rather than miles per hour
epZvE TIL Men at Work's "Down Under" uses the melody of the nursery rhyme "Kookaburra" and the band got sued for it