An adult ruby-throated hummingbird may eat twice its body weight in food each day, which it burns up with the high metabolism necessary to sustain its rapid wing beat and energetic movements.
The western counterpart of the ruby-throated, the black-chinned regularly pumps its tail. Monotypic. Length 3.3–3.8"; bill 16–22 mm. Best marks for all ages are narrow inner primaries and ...