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TIL the whistly/chirpy sound you hear when mourning doves take off and fly isn't a vocalization. The sound comes from specially shaped feathers on the wings. See video for examples

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via reddit.com

wLvKY TIL that Sam, a chimpanzee friend of Michael Jackson’s chimp Bubbles had a testicle bitten off by a celebrity dog on a film they were working on together.
J1pxl TIL in 1986 Mark Wahlberg chased after three black kids, throwing rocks at them while shouting "kill the nier, kill the nier!".
Gdog TIL: a Thermos flask creates a highly efficient thermal insulation by creating a partial vacuum between 2 barriers. Since there’s virtually no air/gas/matter, there’s nothing to carry energy away (bar the canister itself). This is how rocket fuel is stored - in a giant Thermos.
NOWe TIL that the head of the CIA had his AOL email account hacked by a teenager in 2015.
Egk6p TIL Leeches don't only suck blood; they also will swallow small animals whole