A variety of hummingbirds from Ernst Haeckel's 1904 Kunstformen der Natur (Artforms of Nature)A male Ruby-throated HummingbirdHummingbird nest with two chicks in Santa Monica, CAA male Costa's Hummingbird, showing its plumage to good effect
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Hummingbirds are small birds in the family Trochilidae. They are known for their ability to hover in mid-air by rapidly flapping their wings, 15 to 80 times per second (depending on the species). more...

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Capable of sustained hovering, the hummingbird has the ability to fly deliberately backwards or vertically, and to maintain position while drinking from flower blossoms. They are named for the characteristic hum made by their wings.

Hummingbirds are attracted to many flowering plants—shrimp plants, Heliconia, bromeliads, verbenas, fuchsias, many penstemons—especially those with red flowers. They feed on the nectar of these plants and are important pollinators, especially of deep-throated flowers. Most species of hummingbird also take insects, especially when feeding young.

The Bee Hummingbird (Mellisuga helenae) is the smallest bird in the world, weighing 1.8 grams. A more typical hummingbird, such as the Rufous Hummingbird (Selasphorus rufus), weighs approximately 3 g and has a length of 10-12 cm (3.5-4 inches). The largest hummingbird is the Giant Hummingbird (Patagona gigas), with some individuals weighing as much as 24 grams.

Most male hummingbirds take no part in nesting. Most species make a neatly woven cup in a tree branch. Two white eggs are laid, which despite being the smallest of all bird eggs, are in fact large relative to the hummingbird's adult size. Incubation is typically 14-19 days.

Appearance

Hummingbirds bear the most glittering plumage and some of the most elegant adornments in the bird world. Male hummingbirds are usually brightly coloured. The females of most species are duller.

The names that admiring naturalists have given to hummingbirds suggest exquisite, fairylike grace and gemlike brilliance. Fiery-tailed Awlbill, Ruby-topaz Hummingbird, Glittering-bellied Emerald, Brazilian Ruby, Green-crowned Brilliant, Festive Coquette, Shining Sunbeam, and Amethyst-throated Sunangel are some of the names applied to birds in this group.

Aerodynamics of hummingbird flight

Hummingbird flight has been studied intensively from an aerodynamic perspective: Hovering hummingbirds may be filmed using high-speed video cameras.

Writing in Nature, biophysicist Douglas Warrick and coworkers studied the Rufous Hummingbird, Selasphorus rufus, in a wind tunnel using particle image velocimetry techniques and investigated the lift generated on the bird's upstroke and downstroke.

They concluded that their subjects produced 75% of their weight support during the downstroke and 25% during the upstroke: many earlier studies had assumed (implicitly or explicitly) that lift was generated equally during the two phases of the wingbeat cycle. This finding shows that hummingbirds' hovering is similar to, but distinct from, that of hovering insects such as the hawk moths. The differences result from an inherently dissimilar avian body plan (Warrick et al., 2005).

Read more at Wikipedia.org


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