Aggressive Behavior Collection

Black-bellied Hummingbird and Coppery-headed Emerald Hummingbird compete for a feeding
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

Black crested macaque (macaca nigra), Tangkoko National Park, Sulawesi; Indonesia, Asia

A Black-bellied Hummingbird sits on a lobster-claw heliconia while a Green Thorntail
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

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

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

Black-bellied and Coppery-headed Emerald Hummingbirds face off 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

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

A male Green Violetear Hummingbird and a male Grey-tailed or Gray-tailed Mountaingem
Animals, Birds, A male Green Violetear Hummingbird, Colibri thalassinus, and a male Grey-tailed or Gray-tailed Mountaingem, Lampornis cinereicauda

Adult Blue Burmese cat hissing and spitting aggressively, arching the tongue to let out a jet of hot breath, with lips curling back, baring teeth, ears flattened

Two kittens play fighting

Impala, Aepyceros melampus, close-up of two males locking horns, necks bending down, fighting, forelegs anchoring on ground, other Impalas in background, dry scrubland underfoot

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Nature's fierce rivalries: From tropical rainforests to dry scrublands, a common theme in the natural world. Witness the intense competition between Black-bellied Hummingbirds and Coppery-headed Emeralds over a precious nectar source in Costa Rica. In Asia, Black crested macaques in Tangkoko National Park, Sulawesi, engage in territorial disputes. Hummingbirds in Costa Rica, such as Fiery-throated Hummingbirds and Green-crowned Brilliants, fiercely protect their feeding territories. Even in the animal kingdom's gentler corners, like among Blue Burmese cats or playful kittens they can be observed. In the wild, impalas in dry scrublands lock horns in fierce battles for dominance.