Animals, Birds, A Black-bellied Hummingbird, Euperusa nigriventris, warns off a Coppery-headed Emerald Hummingbird, Elvira cupreiceps, attempting to feed on a hairy heliconia flower, Heliconia velleri...

Animals, Birds, A Black-bellied Hummingbird, Euperusa nigriventris, sits on a lobster-claw heliconia while a Green Thorntail Hummingbird, Discosura conversii, hovers nearby in Costa Rica.

Animals, Birds, A Black-bellied Hummingbird and a Coppery-headed Emerald Hummingbird face off in competition for a feeding site on a Costus flower in Costa Rica.

Animals, Birds, Two Fiery-throated Hummingbird, Panterpe insignis, face off on a branch in Costa Rica.

Animals, Birds, A male Green Violetear Hummingbird, Colibri thalassinus, and a male Grey-tailed or Gray-tailed Mountaingem, Lampornis cinereicauda, face off in a territorial display in the Savegre Riv...

Animals, Birds, A female Green-crowned Brilliant Hummingbird, Heliodoxa jacula, protects her feeding spot from another female in Costa Rica.

Animals, Birds, Territorial competition between a male Magnificent Hummingbird, Eugenes fulgens, at right, and a female Green-crowned Brilliant Hummingbird, Heliodoxa jacula, perched on a yellow Costu...