brilliant hummingbird drinking from an orange mexican sunflower - trochilidae

hummingbird rinking orange mexican sunflower drinking hummingbirds birds native americas constituting biological family trochilidae smallest bird humming sound created beating wings flap high frequencies audible humans highest mass-specific metabolic rate homeothermic animal conserve energy food scarce nightly foraging torpor state hibernation slowing 15th normal tiny feet striking brilliant