masayuki has devoted himself to their conservation for almost half a century. >> translator: you have to stay 100 meters away from the birds. if you get closer, the geese fly off right away. they're one of the most easily-frightened of all birds. >> reporter: many species spend the weather here. the most common is the greatate white-fronted goose. this species likes beans, not surprisingly, it's known as the "bean goose." but the 70 year old has a special place in his heart for the aleutian cackling goose. it's an endangered species. he has spent a quarter of a century trying to restore the birds' annual migration between russia and japan. historical records show that in the 18th century, the bird was a common sight in japan. but, by the early 20th century, many off i its b breeding ground been destroyed. the culprit? foxes. introduce t the by humans who prprized the animals for their fur. records show only one of the birds flew to ease knewma in 1982. the following year, he and his conservation group launched a project to revived the species. >>>> translator: many people thought it w