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.
The word hummingbird is a common name for any of the 300 species of the family of small birds of the Americas that share anatomical characteristics of being very swift. The family of hummingbirds are the smallest of all birds measuring about 2 to 4 inches long and weighing in at about. 07 ounces.