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Frogs may have evolved the first kneecaps on Earth

Source
New Scientist

Publication Date
2017-07-06

Frogs legs have sprung a big surprise – contrary to textbook biology, they have primitive kneecaps. The kneecaps are made of dense, fibrous cartilage rather than bone, and appear to be much better suited to soaking up the strains of leaping and jumping than the bony human patella.

Content
https://www.newscientist.com/article/2140017-frogs-may-have-evolved-the-first-kneecaps-on-earth/