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.
Â« Birds by the Numbers | Main | Wild Birds Unlimited Bird of the MonthMourning Dove Â». We all know that birds are amazingly light creatures. The next time you pick up a penny, stop to hold it in the palm of your hand and feel the weight of it. A penny is often used as an example of how much (or how little!) a Ruby-throated Hummingbird weighs! Ruby-throated Hummingbird at WBU Decorative Feeder.