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Stefano Unterthiner

Two Svalbard reindeer battle for control of a harem in Svalbard, Norway, in this image, which won the Mammal Behavior category. Italian photographer Stefano Unterthiner followed these reindeer during the mating season. Watching the fight, he felt immersed in “the smell, the noise, the fatigue, and the pain,” he says. The reindeer clashed antlers until the dominant male, on the left, chased its rival away, securing the opportunity to breed.


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