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Why do smaller hummingbirds beat their wings faster than larger hummingbirds?

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Illustration of a chestnut-collared swift (Cypseloides rutilus) in flight, showing its dark brown body and wings with a distinctive reddish-brown collar around its neck. — Apodiform Chestnut-collared swift (*Cypseloides rutilus*)

The rate at which a hummingbird beats its wings is directly related to its body size: the larger the bird, the lower the wing-beat rate, and conversely, the smaller the bird, the higher the rate.1

This relationship is consistent across species and even between sexes within the same species, where the larger female typically beats her wings more slowly than the smaller male. For example, the tiny Calliphlox amethystina may reach about 80 beats per second, while the much larger giant hummingbird beats its wings only about 10 times per second. This rapid wing-beat capability, which is a result of the unique wing structure and shoulder joint articulation characteristic of the order Apodiformes, is essential for the birds' ability to hover and maneuver efficiently while feeding on nectar.12