Japan's wildlife ranges from subarctic brown bears and fish owls in Hokkaido to a wild cat and a rabbit found only on small subtropical islands of the Ryukyu chain. The country has about 130 species of land mammal, more than 600 recorded bird species (over 250 of which breed), about 73 reptiles and more than 40 amphibians, and many endemic species found nowhere else, despite the islands' isolation from mainland Asia. Its flagship animals are the Japanese macaque or snow monkey, the world's most northerly non-human primate; the red-crowned crane of Hokkaido; the Ussuri brown bear; Blakiston's fish owl, the largest owl alive; the Japanese giant salamander; the critically endangered Iriomote cat; and the Amami rabbit.
A useful way to read the map is Blakiston's Line, the faunal boundary along the Tsugaru Strait between Hokkaido and Honshu. Thomas Blakiston, an English naturalist living in Hakodate, noticed that Hokkaido's animals were related to those of northern Asia while Honshu's resembled species further south, and presented the idea on 14 February 1883. Bears, owls and cranes in the north; monkeys, salamanders and serows in the middle; tropical relics in the Ryukyu Islands to the south.
Japanese Macaque: the Snow Monkeys of Jigokudani
The Japanese macaque lives on Honshu, Shikoku and Kyushu and several smaller islands, all south of Blakiston's Line. Its northernmost troops live on the Shimokita Peninsula at the top of Honshu, and no other non-human primate lives farther north. The southernmost population, on Yakushima, is a separate subspecies. A 1989 study estimated the wild population at 114,431.
The best-known troop bathes in the hot springs of Jigokudani Monkey Park ("Hell's Valley") in Yamanouchi, Nagano Prefecture, part of Joshinetsu Kogen National Park. The valley sits at 850 m (2,800 ft), snow covers the ground for about four months a year, and visitors reach it on a 2 km footpath. The monkeys were originally driven down from the mountains around Shiga Kogen in the 1950s by ski resorts and forest clearance, and in the 1960s they were encouraged to gather at the springs to keep them away from crops. Studies have since linked winter bathing to lower stress levels, with higher-ranking females taking the best spots.
Elsewhere the macaque's success has become a problem. Protection, reforestation and the extinction of its main predator, the Japanese wolf (the last known one was killed in Nara Prefecture in 1905), let numbers grow strongly after the 1940s. Crop damage by macaques cost around 900 million yen in 2019, and more than 20,000 are culled each year.
Red-Crowned Crane: Hokkaido's Tanchō in the Kushiro Wetlands
The red-crowned crane, tanchō in Japanese, is among the rarest cranes in the world and is listed as Endangered by the IUCN. The mainland population migrates between breeding grounds in Russia and north-east China and wintering sites in Korea and China. Japan's birds are different: they form a resident population in eastern Hokkaido that moves only about 150 km between summer and winter grounds. The cranes once lived on Honshu too, but no permanent population survives there.
The heart of the Japanese range is the Kushiro Wetland, 268.61 km² of reedbeds, sedge and peat bog on the Kushiro Plain, crossed by the 154 km Kushiro River. It was registered under the Ramsar Convention in 1980 and became Kushiro-Shitsugen National Park on 31 July 1987. In the snowy months the cranes switch from fish and insects to rice gleanings, and the cranes of Tsurui village are listed among the 100 Soundscapes of Japan.
Japan protected the crane and its breeding grounds as Natural Monuments in 1935, made the Kushiro cranes a Special Natural Monument in 1952, and extended that status to all of Japan's red-crowned cranes by 1967. Winter counts in 2020 found about 1,900 in Japan, the largest single national share of the species. The catch is space: so little nesting marsh remains that the local breeding population is close to saturation, and introduced American mink take eggs and chicks.
Ussuri Brown Bear: Shiretoko's Higuma
Japan's largest land animal is the Ussuri brown bear, found in Japan only on Hokkaido, where it holds a central place in the culture of the Ainu people. Hokkaido's bears typically weigh 200 to 300 kg, and an exceptional bear of 400 kg was captured in 2015. South of Blakiston's Line its place is taken by the smaller Asian black bear of Honshu's mountains.
Japan's largest population of brown bears is on the Shiretoko Peninsula at Hokkaido's north-eastern tip, protected by Shiretoko National Park and listed by UNESCO as a World Heritage Site in 2005. The listing recognised that this is the southernmost point in the Northern Hemisphere where sea ice usually forms: drift ice from the Sea of Okhotsk reaches the coast at about 43° N. Spotted seals, orcas and sperm whales feed offshore. Each winter that drift ice also drives Steller's sea eagles south from Russia; their numbers peak in the Nemuro Strait in late February. At a fishing area called "Banya", mother bears with cubs have spent time near fishermen for more than half a century without a recorded accident, probably to keep their cubs away from aggressive males.
The bears are not harmless. The Sankebetsu incident of December 1915, in which a 380 kg bear killed seven people at Tomamae, remains the worst bear attack in Japanese history, and between 1962 and 2008 Hokkaido recorded 86 attacks and 33 deaths. Visitors to Shiretoko reach much of the peninsula only on foot or by boat.
Blakiston's Fish Owl: Hokkaido's 100–150 Birds
Blakiston's fish owl is the largest living owl, with females weighing up to 4.6 kg and wingspans of 178 to 190 cm. It hunts mainly fish along rivers that stay unfrozen through winter, adding small mammals in the cold months. It nests in hollows of large old trees, usually at least 12 m above the ground. The species was described in 1884 from a specimen collected near Hakodate and named after the same Thomas Blakiston who gave his name to the faunal line.
The IUCN lists it as Endangered. Japan's population, the nominate subspecies, has been estimated at only 100 to 150 birds, around 20 breeding pairs plus unpaired individuals, all in Hokkaido; the global total is about 1,000 to 1,500. Clearance of riverside forest, dams, collisions with cars and power lines, and lead poisoning have all taken a toll. Conservationists have answered with large nest boxes and supplementary feeding. Numbers appear to be recovering slowly, but suitable river forest remains the limit.
Japanese Giant Salamander: the Hanzaki of Western Honshu
The Japanese giant salamander, ōsanshōuo or locally hanzaki, can reach 1.5 m and 25 kg, making it the third-largest amphibian in the world after its Chinese relatives. It lives in fast, cold mountain streams in western Japan, west of Gifu Prefecture on Honshu, with smaller populations on Shikoku and in northern Kyushu; Okayama, Hyogo, Shimane, Tottori, Yamaguchi, Mie, Ehime, Gifu and Ōita prefectures hold strong populations. It feeds on freshwater crabs, fish, frogs and insects, can go weeks without eating, and may live for nearly 80 years in the wild; one captive animal lived 52 years at Artis zoo in Amsterdam.
Philipp Franz von Siebold, physician at the Dutch trading post of Dejima in Nagasaki, sent the first specimen to Leiden in the 1820s. Since the early 1950s the species has held Japan's highest cultural protection as a Special Natural Monument, and as of 2022 the IUCN rated it Vulnerable. Even so, there is no range-wide recovery programme; population surveys are run by volunteer groups such as the Hanzaki Research Institute of Japan, and the Hiroshima City Asa Zoological Park was the first in Japan to breed the species in captivity.
Iriomote Cat: a Wild Cat on a 290 km² Island
The Iriomote cat lives only on Iriomote, an island of about 290 km² in the Yaeyama group of Okinawa Prefecture, roughly 90% of it covered in jungle and mangrove. That is the smallest range of any wild cat in the world. The cat was brought to science in 1965 by the author Yukio Togawa, who collected skins and a skull on the island, and was formally described in 1967 by Yoshinori Imaizumi of the National Museum of Nature and Science in Tokyo.
Population surveys have found a consistently tiny number: 83 to 108 cats in 1982–1984, 99 to 110 in 1993–1994 and 100 to 109 in 2005–2007, and once methods are aligned the trend looks slightly downward. The IUCN has listed it as Critically Endangered since 2008. Traffic is a persistent killer: a road built in 1977 around half the island causes a few deaths every year, so the island now has cat-crossing signs, underpasses and noisy "zebra zones" that warn drivers. Stray domestic cats, which spread disease and hybridise, have been removed.
Amami Rabbit: a Living Fossil on Amami Ōshima and Tokunoshima
The Amami rabbit is a dark-furred rabbit found only on Amami Ōshima and Tokunoshima, two islands between Kyushu and Okinawa. It is often called a living fossil, a survivor of an ancient lineage that died out on the Asian mainland. Japan made it a Natural Monument in 1921, ending hunting, and upgraded it to a Special Natural Monument in 1963, which banned trapping as well. Estimates put about 2,000 to 4,800 on Amami Ōshima and only 120 to 300 on Tokunoshima.
Its worst predators were introduced. The small Indian mongoose was released on Amami to control the venomous habu snake, multiplied, and preyed on rabbits and other endemics such as the Amami jay. The Ministry of the Environment restarted an eradication programme in 2005 and declared the mongoose eradicated on Amami in September 2024. Feral cats remain a threat, and the rabbit needs a mix of young and mature forest that logging roads keep breaking up.
From the drift ice of Shiretoko to the mangroves of Iriomote, these species track Japan's climate gradient almost exactly, which is easier to picture alongside our guide to the climate of Japan. For the north in particular, our Hokkaido island guide covers the landscapes where the cranes, owls and bears live, and our article on the national animal of Japan explains which of these creatures carry official status.