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 weight of Ruby-throated Hummingbirds varies depending on sex, health, and other factors. Females will weigh significantly more when they have eggs in development, and both sexes can double their weight to prepare for migration. Adult males range from 2.5 grams (0.09 ounce) during the breeding season to over 5 grams (0.18 ounce) during migration.