Japanese wolves were last officially recorded in Nagano Prefecture during the Meiji Era (1868-1912). Despite that, there have been a string of supposed sightings in recent years and claims of having heard the animals howling in the wilderness. Yagi, 74, reckons he heard a wolf howling in July 1969 when he stayed at a mountain hut as a staff member on Mount Naebasan near the border between Nagano and Niigata prefectures. He has since devoted much time to tracking down a live specimen. Only three specimens of Japanese wolf exist at the National Museum of Nature and Science in Tokyo and elsewhere in Japan. There are no known photos of live wolves. The only type specimen that could identify the Japanese wolf is kept at a Dutch museum. It was shipped to the Netherlands by German doctor Philipp Franz von Siebold, who arrived in Japan during the late Edo Period (1603-1867). Siebold sent the fur and skull of a Japanese wolf and a "yamainu" (mountain dog). The type specimen's stand refers to the sample as that of a yamainu to raise a question: Is the Japanese wolf the same as a yamainu? Confusion lingers over whether the two animals are the same or different from each other. Japanese wolves were killed off before Japanese researchers took an interest in them. As a result, little is known about the species.