What is Hummingbird?
{{Taxobox | name = Hummingbird | image = Haeckel Trochilidae.jpg | image_width = 250px | image_caption = A variety of hummingbirds from [[Ernst Haeckel]]'s 1904 ''[[Kunstformen der Natur]]'' (Artforms of Nature) | regnum = [[Animal]]ia | phylum = [[Chordate|Chordata]] | classis = [[Bird|Aves]] | ordo = '''Trochiliformes'''<br>or [[Apodiformes]] | familia = '''Trochilidae''' | familia_authority = [[Nicholas Aylward Vigors|Vigors]], 1825 }} '''Hummingbirds''' are small [[bird]]s of the [[family (biology)|family]] '''Trochilidae'''. They are among the smallest of birds: most [[species]] measure 7.5–13&nbsp;cm (3–5&nbsp;in). The smallest living bird species is the 2–5&nbsp;cm [[bee hummingbird]]. They can hover in mid-air by rapidly flapping their [[wing]]s 12–80 times per second (depending on the species). They are also the only group of birds able to fly backwards.<ref>Ridgely, Robert S. and Paul G. Greenfield. 2001. ''The Birds of Ecuador'', volume 2, Field Guide, Cornell University Press.</ref> Their rapid wing beats do actually [[wikt:hum|hum]]. They can fly at speeds over 15&nbsp;m/s (54&nbsp;km/h, 34&nbsp;mi/h).<ref>Clark and Dudley 2009. Flight costs of long, sexually selected tails in hummingbirds. ''Proceedings of the Royal Society of London''.</ref> == Eating habits and pollination == Hummingbirds help flowers to pollinate, though many other insects also do so. The hummingbird depends absolutely on the nectar, more so that any other bird. Hummingbirds do not have a good sense of [[Olfaction|smell]]; instead, they are [[wikt:attract|attracted]] to [[color]], especially the [[color]] [[red]]. Unlike the butterfly, the hummingbird hovers over the flower as it drinks nectar from it, like a [[moth]]. When it does so, it flaps its [[wing]]s very quickly to stay in one place, which makes it look like a blur and also beats so fast it makes a humming sound. A hummingbird sometimes puts its whole head into the flower to drink the nectar properly. When it takes its head back out, its head is covered with [[yellow