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TIL hummingbirds, due to their size, are preyed upon by a number of unusual animals, including spiders and praying mantis.

Read more hummingbirdsociety.org

via reddit.com

9Ywmr TIL of the huia bird. It went extinct in 1907 and its call was never recorded, but it exists today because an elderly Maori man imitated in 1949 from memories of his childhood.
wLRjW TIL Colorado researchers have 3D printed miniature Lego-style bone bricks that can heal broken bones. The blocks, which are the size of a flea, help regrowth and can be interlocked like toy bricks. They hope to scale the technology and use it to supply laboratory-made organs for human transplant.
kOKke TIL The sun makes up 99.8 percent of the mass in the solar system.
KOe69 TIL National Dollar Day on August 8th commemorates the day Congress established the U.S. monetary system in 1786. In 1862, the United States printed its first dollar bill. It wasn’t George Washington face, The first dollar bill featured Salmon P. Chase, President Lincoln’s Secretary of Treasury.
Z4rY TIL that Poland didn’t border any of the countries that it does now in 1989, without changing its borders.