Aggressive Behavior Collection

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

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

Fiery-throated Hummingbirds in Cost Rica

Territorial competition between a male Magnificent Hummingbird at right

Guadalupe fur seals (Arctocephalus townsendi)

Black-bellied and Coppery-headed Emerald Hummingbirds face off in Costa Rica

Competition between two Green-crowned Brilliant Hummingbirds in Costa Rica

A male Green Violetear Hummingbird and a male Grey-tailed or Gray-tailed Mountaingem

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

Two kittens play fighting

Adult Blue Burmese cat hissing and spitting aggressively

Impala, Aepyceros melampus, close-up of two males locking horns

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EDITORS COMMENTS

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.