The Animal World | Can Any Birds Fly Upside Down?

Can any birds fly upside down?

Hummingbirds are the only birds that can fly upside down. They do so because of their angled wing structure. However, a hummingbird can fly upside down only for a short period of time. A hummingbird can also fly backward; it does this when removing its bill from a tube flower.

Source: Kuttner, Paul. Science's Trickiest Questions, p. 128.

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