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Hummingbirds are the smallest birds, but proportionately, one part of their body is larger than any other bird. Which part?

Answer:

The brain of a hummingbird makes up 4.5% of its body mass, making it proportionately larger than the brain of any other bird. By comparison, our brain is only about 2% of our mass. The part of their brain that processes movement is extremely developed, proportionately 2 - 5 times bigger than any other bird. This helps them in hovering, making it easier for them to hold an exact position.
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