Anna's hummingbirds can shake their bodies 55 times per second to shed rain while in flight, or remove pollen or dirt from their feathers in dry weather. Each twist lasts four-hundredths of a second and applies 34 times the force of gravity on the bird's

Anna's hummingbirds can shake their bodies 55 times per second to shed rain while in flight, or remove pollen or dirt from their feathers in dry weather. Each twist lasts four-hundredths of a second and applies 34 times the force of gravity on the bird's