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 smallest hummingbird species in the world is the Cuban Bee Hummingbird, Mellisuga helenae, and it measures 5-6 cm in length (2.0-2.4 inches) and weighs a mere 1.6-1.9 grams (roughly 1/14 of an ounce). Most species, however, are larger: in the U.S., most species are 3.0 - 3.5 inches in length. Hummingbird moths are considerably smaller than the smallest hummingbird. This recognition problem is perhaps the single most common query presented to the Hummingbird Society, often with a photo attached. Some are not convinced, despite the scientific evidence. When in doubt, one can always get closer and count the legs...it is a sure way to distinguish between an insect and a bird!