In the South American tropics, where hummingbirds must compete for food, evolution has drastically reshaped their bills. They are thicker and more rigid, often with a hook on the end. In some cases, they have jagged points, like rows of teeth — all the better for fighting off rivals!
Read the story here: https://www.nytimes.com/2019/02/05/science/hummingbirds-science-take.html
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