Alexander Nikolaevich Формозов (1899-1973) is the known scientist, environmentalist, зоогеограф, professor of Moscow University. He, author of many scientific monographs, is more known the wide circle of readers as a remarkable animal artist-painter and writer. His popular scientific books "Six days in the forests" and "Among nature" reprinted repeatedly. However known his work is "Companion of hunter". Due to her there are many generations beginning Russian naturalists able to learn to read "письмена" of nature, penetrate in secrets the life of beasts and birds hidden from our eyes. А. Н. Формозов could not live without intermingling with nature, his love to her was repeatedly increased by knowledge of the thinnest details of her existence. Besides we are called by this book - without observation, without knowledge veritable love to nature is impossible.