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.
Hummingbirds belong to the avian family Trochilidae and their closest relatives are the equally fascinating swifts. Hummingbirds are small (2-20 grams), with long narrow bills, and small saber-like wings.hat it takes for a flower to attract hummingbirds. Flowers that attract hummingbirds: 1  Provide a large amount of nectar with a substantial sugar content to support the demanding hummingbird life style.