The Green Violet-ear Hummingbird (Colibri thalassinus) belongs to the order Apodiformes. Hummingbirds share this order with the swifts, such as the white-collared swift. The name Apodiformes is derived from the Greek words "a pous," meaning "without foot." While apidiforms do in fact have feet, they are quite small and their legs are short and relatively weak. Many birds in this order cannot walk, must fly to turn around on a branch and don't land on the ground.
Golden-bellied Starfrontlet, Coeligena bonapartei: Chicaque, CO - (c) Pete Morris / Birdquest