Hummingbirds are birds from the Americas that constitute the family Trochilidae. They are among the smallest of birds, most species measuring 7.5–13 cm (3–5 in) in length. Indeed, the smallest extant bird species is a hummingbird, the 5 cm (2.0 in) bee hummingbird weighing less than 2.0 g (0.07 oz).
They are known as hummingbirds because of the humming sound created by their beating wings which flap at high frequencies audible to humans. They hover in mid-air at rapid wing-flapping rates, which vary from around 12 beats per second in the largest species, to in excess of 80 in some of the smallest. Of those species that have been measured in wind tunnels, their top speed exceeds 15 m/s (54 km/h; 34 mph) and some species can dive at speeds in excess of 22 m/s (79 km/h; 49 mph).
Hummingbirds have the highest metabolism of any home othermic animal. To conserve energy when food is scarce, and nightly when not foraging, they can go into torpor, a state similar to hibernation, slowing metabolic rate to 1/15th of its normal rate.
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If a bird has very long legs, then it probably spends most of its time walking, like a crane, or wading, like a flamingo. So they can reach their food. Bird with short legs necks like pelicans, geese and swans are birds that swim well and dive their heads into the water for food. Their beaks are often flat for scooping up water weeds. A pelican's beak can change into a shape like a huge bucket for catching fish.
Very attractive and interesting gallery especially for those who are possessed with bird watching. High-quality images from birds all around the world. This application is worth having it on your smartphone. In the gallery you can find images of very different birds, from humming birds to big flying beasts like eagles. Funny and interesting birds like parrots in different sizes and amazing colors. They are unique warm-blooded species that have wings and feathers and they can fly. Try this free application and get closer to the mysterious and interesting world of birds.
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