Mount Fuji Wildlife: Animals, Plants and Where to See Them
TripToJapan.com Editorial Team
Sep 3, 2026
TripToJapan.com Editorial Team
Above 2,500 meters on Mount Fuji almost nothing lives. The ground is loose volcanic scoria, there is no soil worth the name, and the wind strips heat out of anything that tries. Then a small gray bird lands three meters from your boot and starts picking at the gravel, entirely unbothered. The alpine accentor is the highest-dwelling bird on the mountain, and it is tame because so few things up there have ever wanted to eat it.
Mount Fuji supports around 37 mammal species and more than 100 bird species, almost all of them in the forest belt rather than on the bare cone. The wildlife worth traveling for is at the base: sika deer, Japanese macaques, serow, foxes, and the lava-flow forest of Aokigahara, which grew on ground laid down by an eruption around 1,200 years ago.
Fuji is a young volcano with almost no erosion, so its vegetation sorts itself into clean horizontal bands. Walking up is a compressed journey from temperate forest to tundra in a single morning.
Up to about 1,600 meters the slopes carry broadleaf and mixed forest: Japanese beech, oak, maple, and the hinoki cypress that dominates the lava-flow woodland at the base. This is where the animals are.
From roughly 1,600 to 2,400 meters the forest thins into subalpine conifer, mostly Veitch's fir and Erman's birch, with trees getting shorter and more twisted as you climb.
Above about 2,400 meters the treeline ends and the mountain turns to scoria and rock. What survives here is low, tough, and slow-growing: rock cinquefoil, alpine sorrel, and cushion plants rooted in ash pockets.
The summit itself is effectively sterile. Snow sits on it for much of the year and temperatures hover near freezing even in midsummer.
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Sika deer are the most likely large mammal you will see, particularly at dawn in forest clearings around the Five Lakes. Numbers have grown enough that browsing pressure on young trees is a management concern.
Japanese macaques live in troops in the lower forests. They are the same species as the snow monkeys of Nagano, without the hot spring.
Japanese serow is the one worth hoping for: a stocky, goat-like animal with short horns, protected as a national natural monument. It is solitary, slow-moving, and usually seen alone on a steep wooded slope.
Asiatic black bears are present in small numbers in the surrounding forest. Encounters are rare, and carrying a bell on quieter trails is standard practice in Japan.
The Japanese marten is endemic to Japan and one of the more striking animals here, with a cream face and a dark body. Red foxes, Japanese hares, wild boar, weasels, and Japanese giant flying squirrels fill out the list.
The species you see depends almost entirely on how high you are.
Above 2,500 meters, the alpine accentor and the spotted nutcracker are the two residents. The nutcracker caches pine seeds in fall and remembers where it put them, and it is the bird most climbers notice.
In the forest belt, look for the Japanese accentor, the Siberian blue robin, coal tits, woodpeckers, and the copper pheasant. Birdsong in the Aokigahara woodland in May is the best it gets.
Around the Five Lakes, waterfowl gather through winter, including whooper swans on Lake Kawaguchi, which is the source of most of the swan-and-Fuji photographs you have seen.
Aokigahara spreads across roughly 30 square kilometers on Fuji's northwest flank, growing on a lava flow from an eruption in the 860s. That origin explains everything odd about it.
The lava left almost no soil, so trees root shallowly across the rock and their root systems sprawl sideways in visible mats. The ground is uneven, full of hollows and collapsed lava tubes, and thick moss covers most surfaces. Because the canopy is dense and the terrain absorbs sound, the forest is genuinely quiet in a way few places are.
It is a designated natural monument and one of the most intact ecosystems around the mountain. Hinoki cypress and hemlock dominate. Deer, foxes, wild boar, weasels, and flying squirrels live here, and research on the woodland's butterfly communities has identified it as a diversity hotspot worth conserving.
Several lava caves are open to visitors, including ice caves that hold frozen columns into summer. Narusawa Ice Cave and Fugaku Wind Cave are the two easiest to reach, both with lit walkways and small entrance fees.
Stay on the marked trails. This is not superstition: the compass behaves unpredictably over magnetic lava, the terrain looks identical in every direction, and people do get lost. The main paths from the Saiko Bat Cave area and the caves are well signed and perfectly safe.
Aokigahara also carries a long association with suicide, and there are signs and patrols reflecting that. Visitors walking the marked routes will see little of it, but it is the reason to treat the forest with more care than a casual walk in the woods.
Spring brings Japanese azalea and rhododendron to the lower slopes, followed by wild cherry. The Fuji Shibazakura Festival at the base carpets a field in moss phlox from mid-April into May, which is a planted display rather than wild flora but draws large crowds.
Summer is the alpine season. Above the treeline, rock cinquefoil, alpine sorrel, and Fuji thistle flower in the short window between snowmelt and the first frosts.
Fall turns the birch and maple belt yellow and red from mid-October, working down the mountain over several weeks. Our guide to cherry blossom timing across Japan covers the spring end of the calendar.
You do not need to climb. Almost all the animals live below the treeline, and the climbing route above the Fifth Station is the worst place on the mountain for wildlife.
The Five Lakes area is the practical base, with forest trails around Lake Saiko and Lake Shoji that see a fraction of the Kawaguchiko crowds.
Dawn and dusk are the only times that reliably work for mammals. Deer and macaques are active early, and most things else are nocturnal.
Late spring and early fall give the best combination of active wildlife, comfortable walking, and open trails. Winter closes higher routes but brings swans and waterfowl to the lakes.
Keep your distance, never feed anything, and store food securely. Feeding macaques in particular creates animals that later have to be destroyed.
For routes away from the main tourist corridor, our guide to quieter paths around Mount Fuji covers the trails worth the extra effort.
A guided tour from Shizuoka approaches the mountain from the quieter southern side, which sees a fraction of the Kawaguchiko traffic.
The climbing season is short and the rules are now strict.
Yoshida and Subashiri trails: open 1 July to 10 September
Fujinomiya and Gotemba trails: open 10 July to 10 September
Entry fee: ¥4,000 per climber, charged on all four trails
Yoshida trail: capped at 4,000 climbers a day, with online reservation through the official Fujisan climbing site
Shizuoka trails: registration and safety training through the FUJI NAVI app
Gates close 14:00 to 03:00 to everyone except climbers with a confirmed mountain hut booking
Rangers check gear at the Fifth Station and can turn you back without boots, two-piece rain gear, and warm layers. Summit temperatures sit near freezing even in August.
Fuji is three volcanoes stacked on one another, the current cone built over the last 10,000 years. The last eruption was the Hoei eruption of 1707, which opened a crater on the southeast flank you can still see clearly and dropped ash on Edo, 100 kilometers away. It is classified as active, and Japan's volcano monitoring keeps instruments on it continuously.
That geology is the reason for the wildlife. Young volcanic soil, abundant groundwater filtering through porous lava, and a thousand-meter range of elevation in a small area produce more habitat variety than the mountain's size suggests.
Background on Fuji's place in Japanese life fills in the cultural side.
Two nights at the Five Lakes is enough for the forest trails, the caves, and a dawn walk. Add a third if you want Aokigahara properly rather than as a stop.
The area works year-round, which is unusual. Winter brings the clearest Fuji views of the year along with the lake birds, and our guide to Japan's winter season covers what else is running then.
For a longer route that reaches the mountain and keeps going, a coastal journey from Fuji to the sea builds the region into a full trip.
More on the lakes, the trails, and getting there sits in our Mount Fuji guide.
