Fonseca's photograph of the leopard, a species threatened by poaching, habitat destruction, and human-animal conflict, was obtained with a bait-free camera trap positioned for three years in the Indian Himalayas, where animal motions trigger a hidden digital camera.
In a statement announcing the winners, Douglas Gurr, director of the Natural History Museum, stated that Fonseca's photograph "reminds us of our common obligation to conserve" these endangered animals and the Earth.