Larus crassirostris
Silhouette: Sharon Wegner-Larsen · PhyloPic
In 3 days ~80% in a week >90%
The black-tailed gull (Larus crassirostris) is a gull native to shorelines of East Asia. The black-tailed gull is medium-sized (46 cm or 18.1 in), with a wingspan of 126–128 cm (49.6–50.4 in). It has yellow legs and a red and black spot at the end of the bill. Males and females have identical plumage and features, although males are larger in size than females. This gull takes four years to reach full adult plumage. As the name suggests, it has a black tail. The bird has a cat-like call, giving it its Japanese name — umineko (海猫, 'sea cat'), and Korean name — gwaeng-yi gull, which means 'cat' gull. In Hachinohe their calls are one of the 100 Soundscapes of Japan.
The species is resident to coastlines of the East China Sea, Japan, Manchuria and the Kuril Islands. It is a vagrant to Alaska and North America and has been found in the Philippines. The bird is common in Japan, nesting from Hokkaido to Western Kyushu. It has caused flights to be delayed at Haneda Airport in Tokyo.
An enormous gathering of black-tailed gulls can be found at Kabushima, a peninsula (formerly an island) in Hachinohe, Aomori, Japan. A Shinto shrine... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Zhuhai Chimelong Ocean Kingdom | 🇨🇳 China | |
| 2 | Chimelong Spaceship | 🇨🇳 China | |
| 3 | Tierpark Berlin | 🇩🇪 Germany | |
| 4 | Zoorasia | 🇯🇵 Japan | |
| 5 | Walsrode World Bird Park | 🇩🇪 Germany | |
| 6 | Beijing Zoo | 🇨🇳 China | |
| 7 | Beijing Aquarium | 🇨🇳 China |
Likely
About 40% of wildlife watchers report a Black-tailed Gull sighting in Dalian on a given day, based on 34 verified sightings from GBIF citizen-science data. It is the 4th most-seen of the 46 birds we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
January–February and September
In those months about 50% of wildlife watchers report a Black-tailed Gull in Dalian on a given day, against about 30% in December, the lowest month. Those are among Dalian's driest months, with about 25 mm of rain a month against 170 mm in August. March–May, August and October–November have too few records to rate.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Black-tailed Gull sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 20
Of the 20 cities where we can rate Black-tailed Gull sightings, Dalian ranks 2nd at about 40%. The best odds are in Busan (South Korea, about 60%).
Same family: Laridae
The closest relatives of the Black-tailed Gull that you can see in Dalian (family Laridae, Gulls, Terns, and Skimmers) are Black-headed Gull (about 10%) and Saunders's Gull (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Black-tailed Gull is recorded against all the birds logged in Dalian (34 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.
