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.
Anna's Hummingbird wings beat about 40-50 times per second in normal flight. 30% of a hummingbird's weight consists of flight muscles. Hummingbirds fly about 25mph in normal flight and up to 40mph in a courtship dive. The heart beats about 250 times per minute while at rest, about 1,220 per minute while flying, but slows to 50 beats per minute at night (this is called torpor).