Siberian Tiger, Tiger, tigers, Amur Tiger, Panthera tigris altaica, mammal, mammals, animals, animal, wildlife, fauna, predator, carnivore, big cat, big cats, bigcats, cat, cats, feline, wild cat, endangered species, captive, winter, snow, marking, sign, scratching, clawing, vertical, behavior, territorial behavior, territorial, Siberian Tigers, leesonphoto