A Hundred Joys, or The Book of Great Discoveries 1982 one on netflix

As a seven-year-old boy, he once visited his uncle for the first time and was captivated by the beauty of the taiga. Years later, becoming a biology student, the hero comes to these places and receives the first lessons of morality in communicating with the natural world… Having once witnessed a barbaric hunt, when dozens of birds were exterminated before his eyes for the sake of boredom, the hero vowed never to pick up a gun again and became a passionate defender of all living things on earth.