Two bisons on post stamp

Keywords:

collection, stamp, picture, communications, postage, mail, post, postmark, label, zigzag, canceled, mark, philately, symbol, USSR, soviet, Russia, Bialowieza, Forest, reserve, wild, wildlife, woodland, mammal, animal, bison, dense, duel, combat, struggle, fight, butt, gore, bull, strength, force, power, energy, nature, conservation, fauna, brute, brown,