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If a predator is lurking nearby, a mother mallard will pretend to be injured to distract it from her brood.

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8ewwP TIL that since coming out as gay, Judas Priest frontman Rob Halford has decided to avoid returning to certain parts of the world for fear of lapidation (being stoned to death).
4XwEN TIL Jupiter's moon Europa is covered by a thick layer of ice, with a huge subsurface ocean of liquid water underneath it. Estimates give the ocean an average depth of 100km, and a radius of 877km. This equates to 3 times the combined volume of water of Earth's oceans.
ExkX TIL there is a huge catfish known as the Piraiba, one of which was reported as having swallowed a human whole in the 90s.
v1Omx TIL APOPO, a Tanzanian wildlife agency trained African Pouch rats to sniff out landmines and diagnose tuberculosis by smelling sputum samples. The rats were so effective that the US Fish and Wildlife Department spent $100,000 on a program where Pouch rats were trained to combat wildlife trafficking.
e4nL TIL that, in the early nineties, Martin Scorsese and Steven Spielberg literally traded movie properties they were no longer interested in making. The films? Cape Fear (1991) and Schindler’s List (1993).