Red-crowned cranes: wetland life and changing conservation goals

Residents in Hokkaido, migrants on the continent

Japan’s cranes breed principally in Hokkaido and are resident. Continental populations breed in places including northern China and eastern Russia and winter in China and the Korean Peninsula. Resident birds in Hokkaido still move between breeding and wintering areas.

Wetlands for breeding

Wetlands provide space for nesting, feeding, and raising chicks. Extensive wetland loss through development in Hokkaido has reduced this habitat. As crane numbers recovered, a shortage of suitable breeding sites became a conservation problem.

An omnivorous diet

Cranes eat small animals such as fish, frogs, crustaceans, and snails, as well as plant leaves, shoots, stems, and fruits. Kyushu University’s account from Ashoro also describes feeding in farmland and using fodder maize.

Calls, dances, and pairs

Tama Zoological Park describes generally strong pair bonds: cranes usually breed with the same partner each year. In winter, pairs call together and dance face to face.

Both parents care for the young

A spring clutch commonly has two eggs. Both partners incubate and feed the chicks. Breeding needs suitable wetland habitat, so winter gatherings at feeding stations show only one part of the annual cycle.

From a wetland nest to first flight

The scenes represent developmental stages, not the numbers or survival rate of one brood. The spread-wing scene does not depict take-off.

Tsurui Village’s account of the crane’s annual cycle in Hokkaido begins with pairs entering wetlands and establishing territories in spring. They pile dry reed stems into a nest, usually lay two eggs and incubate them for about a month. Within days, chicks can walk with their parents, but still receive food; walking is not the same as independent life or flight.

During summer, the brownish juvenile plumage gradually gives way to white, and flight becomes possible at roughly a hundred days. A breeding wetland therefore provides more than a place for the nest: it supports the young through the interval before they can fly with their parents. These timings describe local Hokkaido conditions rather than a fixed calendar for every bird.

Winter with the parents, then separation

The last scene uses separated positions to represent family separation; it does not depict chasing or migration.

In autumn, harvested maize fields and grassland around Tsurui offer food. Snow and severe cold make natural food harder to obtain, drawing cranes toward feeding stations. In the evening they move to nearby unfrozen water to roost, so their daytime feeding site and night resting place need not coincide.

Even after attaining flight and almost adult size, juveniles winter with their parents and retain brown feathers. From around February of the following year, parents encourage separation by rebuffing the young or flying away without them; young birds subsequently form groups. Residence in Hokkaido still involves movement between breeding, autumn feeding and winter sites.

Migratory cranes need a chain of habitats

The 2019 review by ICF and the IUCN Crane Specialist Group distinguishes a continental migratory population from the island population resident mainly in Hokkaido. Continental birds breed in northeastern China and the southern Russian Far East and winter along China’s eastern coast and on the Korean Peninsula. They need usable breeding, stopover and wintering sites, so protection of a nesting area alone cannot cover the year.

The review contrasts natural coastal wetlands at Yancheng in China with rice fields near Korea’s Demilitarized Zone: winter food and human pressures differ by site. It discusses altered water flows, fragmentation and coastal development across this habitat chain. Recovery measured in Hokkaido does not by itself describe the continental population.

Mikawashima: feeding and shogunal hunting

Tokyo Metropolitan Library explains that cranes visited Mikawashima in Edo, where bamboo enclosures were erected for feeding each November. It was also a site of tsuru no onari: the shogun used hawks to capture cranes for presentation to the court. This management served a hunting purpose.

Hunting and habitat loss

The 2023 conservation plan links the decline from late Edo into Meiji to hunting and wetland development. The Japanese population was thought to have disappeared before a small surviving group was found again in the Kushiro wetlands in the 1920s.

1935: protecting breeding grounds

Breeding grounds were designated a Natural Monument in 1935, and a local crane protection association formed that year. Releasing loaches, scattering buckwheat, and planting water dropwort followed in 1936. Early efforts to establish reliable feeding were not immediately successful.

1950–62: winter feeding takes hold

Some cranes began taking maize scattered in Akan fields in 1950. Heavy snow and cold in 1952 helped establish feeding, when only 33 birds were confirmed. Special Natural Monument designation followed that year, and Hokkaido commissioned local residents to feed cranes from 1962.

1967–84: wider protection and government programmes

Agency for Cultural Affairs records show that in 1967 the Special Natural Monument designation covered the crane itself without a geographical limit. Part of its former protected breeding habitat entered the enlarged Kushiro Wetland natural protected area. The Environment Ministry also records the Environment Agency beginning feeding and other conservation work in 1984.

1956: cranes return to Korakuen

Crane keeping at Korakuen had stopped after the war. Following Guo Moruo’s 1955 visit and promise to seek birds, two arrived aboard the Kōan Maru in 1956, named Chame and Kurome. Later assistance also came from Kushiro. This is a history of captive care and exchange.

1993: legal designation and a recovery plan

In 1993 the crane was designated a National Endangered Species under Japan’s species conservation law, alongside a protection and recovery plan. Work included feeding, habitat improvement, monitoring, and care for injured birds with investigation of the causes.

Concentrated feeding can concentrate risk

Winter feeding helped recovery, but large gatherings around a few stations can increase risks such as infectious disease. A 2007 policy addressed feeding seasons, foods, locations, and habituation to people, incorporating accident prevention into management.

2013–23: dispersal and natural foraging

A habitat dispersal plan was adopted in 2013, with feeding quantities adjusted at three major stations from fiscal 2015. After a fiscal 2020 review, the 2023 version 2.0 continued to seek dispersed breeding and wintering sites and populations less dependent on artificial food.

Farmland, traffic, and proximity to people

Use of farmland, livestock holdings, and maize can bring crop damage, traffic accidents, and other conflicts. The dispersal plan notes that reducing concentration at a feeding station may send birds to nearby farms instead of immediately creating a naturally feeding population. Monitoring and local cooperation remain necessary.

January 2026: 1,864 wild birds confirmed

Hokkaido’s survey centred on 23 January 2026, with supplementary observations on 21–22 and 24–25 January, covering 392 districts in 49 municipalities across eight subprefectural jurisdictions. It confirmed 1,864 wild birds and 38 captive birds, or 1,902 combined. These are survey counts, not a global population total.

March 2026: Near Threatened in Japan

Japan’s Ministry of the Environment announced a change from Vulnerable to Near Threatened on 17 March 2026. The crane left the threatened categories but remained on the national Red List as NT. Its legal species designation continues. ICF’s 2025 status compilation lists the species’ global IUCN category as Vulnerable. Japan’s Near Threatened category and the global Vulnerable category assess different geographical scopes.

Restoring reeds and winter water

The Wild Bird Society of Japan describes a specific problem at Onnenai in its Hayase reserve in Tsurui: sediment entering from surrounding development encouraged alder growth, and cranes could no longer breed there after 1994. Alder removal and reed-bed restoration began in 1999; breeding resumed in 2002. “Restoring wetlands” here means a particular vegetation intervention followed by records of renewed breeding.

Winter requires different work. In 2009, the Tsurui–Itō sanctuary created a channel that remained unfrozen and thinned trees to make it usable; the society reports crane use of these sites. A breeding reed bed and a winter shallow-water feeding site address different needs.

How three feeding stations adjusted food

The second dispersal action plan, published in 2023, reviews food adjustments at the three large stations of Tsurumidai, Tsurui–Itō and Akan. Beginning in fiscal 2015, maximum feeding amounts were reduced to ease excessive concentration. During fiscal 2015–19, each annual reduction equalled ten percent of the fiscal 2014 maximum; by the plan’s publication the maximums were at least fifty percent lower than that baseline.

The subsequent arrangements were not identical. The two Tsurui stations were to retain their fiscal 2021 maximums through fiscal 2023 before further consultation, while Akan was to reduce its maximum by ten percent of the previous year’s level through fiscal 2024. These are arrangements in a 2023 plan, not evidence that every later measure had been completed by 2026.

Fewer station visits require further questions

A fall in station attendance may indicate dispersal, but birds may instead be eating livestock feed at nearby farms. The 2023 plan asks about both possibilities. Alongside counts, visiting days and residence time, it uses information from marked birds, examines natural feeding sites and investigates damage to farming.

Evaluation also concerns survival and reproduction: proposed indicators include monitored breeding sites, fledging success, the proportion of juveniles in winter surveys and the nutritional condition of recovered birds. Wintering cranes still require accessible feeding ground or shallow flowing water, with safe unfrozen roost water nearby. Food reduction therefore has to be considered with habitat and possible adverse effects; fewer birds at a station alone do not establish success.

An Ainu name and a crane dance

The Riwka cultural information centre at Obihiro Centennial City Museum explains sarorunkamuy as a kamuy within the reedbed. It records the crane dance サロルンリㇺウセ transmitted by the local preservation society 帯広カムイトウウポポ保存会.

Cranes on an older 1,000-yen note

The crane also appeared on a modern banknote. A 2002 Finance Ministry redesign notice identifies the then-current 1,000-yen note as having Natsume Soseki on the front and red-crowned cranes on the back. Its proposed replacement used Mount Fuji and cherry blossoms.