Stock photography, photos: Wolf Stock photos of Wolf at Barcelona's zoo Photograph: © Xavier Deltell Click for a larger image and more information Keywords associated with this stock photo: wolf, wolves, winter, grey, lupine, animal, mysterious, fear, afraid, nature, outside, wild, wilderness, free, rogue, alpha, male, leader, pack, outside, alone, lone, outdoors, power, intense, dark, fur, face, color, colour, captivity, cage, europe, spain, barcelona, zoo