Gorsachius goisagi
In 3 days <5%
The Japanese night heron (Gorsachius goisagi) is a species of night heron found in East Asia. It breeds in Japan, and winters in the Philippines and Indonesia. It is also seen in the spring and summer in Korea and the Russian Far East.
The Japanese night heron prefers dense, damp forest, in both its breeding and winter ranges. Common until the 1970s, this species is threatened by deforestation in its summer and winter ranges for timber and farmland. Other documented threats include the introduction of the Siberian weasel (Mustela sibirica) in its breeding range and nest predation by crows, due to the increasing crow populations. The current population is estimated at less than 1,000 mature individuals. Accordingly, the Japanese night heron is marked as a protected species in Japan and Hong Kong.
Future actions proposed to conserve this species include surveying its breeding habits throughout Japan and the Philippines, protecting its habitat, creating more public interest and awareness in the bird, and stopping invasive species from competing with it.
The Japanese night heron was formally described in 1835 by Dutch zoologist Coenraad Jacob Temminck under the binomial name... Wikipedia →
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Taiwan · 2021
© Sunny Tseng · XC661525 · CC BY-NC-SA 4.0
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Tokyo | 🇯🇵 Japan |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Miyazaki City Phoenix Zoo | 🇯🇵 Japan | |
| 2 | Inokashira Park Zoo | 🇯🇵 Japan |
Rare
Under 5% of wildlife watchers report a Japanese Night Heron sighting in Tokyo on a given day, based on 80 verified sightings from GBIF citizen-science data. It is the 144th most-seen of the 229 birds we can rate there. Over three days the chance rises to under 5%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Japanese Night Heron in Tokyo on a given day, so our monthly data shows no clear season.
Only Tokyo, in our data
Tokyo is the only city on Wallace's Line with enough records to rate Japanese Night Heron sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Ardeidae
The closest relatives of the Japanese Night Heron that you can see in Tokyo (family Ardeidae, Herons, Egrets, and Bitterns) are Grey Heron (about 60%), Little Egret (about 50%) and Great Egret (about 50%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Japanese Night Heron is recorded against all the birds logged in Tokyo (80 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
