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.
More than 350 different species of hummingbirds inhabit the Western Hemisphere, and bill lengths differ among the separate types. The lengths of hummingbird bills vary from as short as 8 millimeters to as long as 119 millimeters -- about 4 1/2 inches.