cellular - characterized by or divided into or containing cells or compartments (the smallest organizational or structural unit of an organism or organization); the cellular construction of a beehive; any effective opposition to a totalitarian regime must be secretive and cellular.
They are among the smallest of birds, most species measuring in the 7.5â13 cm (3â5 in) range. Indeed, the smallest extant bird species is a hummingbird, the 5-cm bee hummingbird, weighing less than a U.S. penny (2.5 g). They are known as hummingbirds because of the humming sound created by their beating wings which flap at high frequencies audible to humans.
It depends on the size of the bird. The largest, the Giant Hummingbird, has a wingbeat rate of 10-15 per second. The fastest recorded rate was about 80 per second, on a tiny Amethyst Woodstar, and the slightly smaller Bee Hummingbird - the world's smallest bird - may have an even faster rate.