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TIL male dolphins form alliances and aggressively pursue females to mate. The females frequently "bolted", but only managed to escape 1/4 attempts. Male dolphins sometimes also commit infanticide so that their mothers will come back into estrus. Dolphins also occasionally practice incest.

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nl9W TIL that the term “Swan Song” comes from a belief dating back to 3rd century B.C. that the Mute Swan is silent its entire life until it sings one beautiful song right before it dies.
Mem6A TIL that the red-crested tree rat, thought to have gone extinct 119 years ago, showed up out of the blue at a hotel in Colombia where two conservationists were staying and let them photograph him for a few hours before disappearing again.
dPnQ TIL a dutch man named Jan de Doot, in 1651, removed his own bladder stone with a kitchen knife. He pulled it out through an incision he made in his perineum. It was the size of an egg and weighed a quarter of a pound. He lived for years after, and had the stone plated in gold.
wLdr7 TIL When a Louisana woman was kidnapped by her ex-boyfriend, she was rescued by her family. When his involvement became known, they went to his house ahead of the police. They kicked the front door down and shot him 3 times, killing him. They’d walked in on him stabbing her. None were charged.
16lkV TIL the St Bernard in Beethoven 1 & 2 was named “Chris” and he retired to a farm when he got too old to act (also there are 8 Beethoven movies)