Larus saundersi
In 3 days <5% in a week ~10%
Saunders's gull (Saundersilarus saundersi) or Chinese black-headed gull, is a species of gull in the family Laridae. It is found in China, Japan, North Korea, South Korea, Macau, Russia, Taiwan, and Vietnam. Its natural habitats are estuarine waters and intertidal marshes. As with many other gulls, it has traditionally been placed in the genus Larus, but based on phylogenetic work some have moved it to Chroicocephalus, while others argue it is sufficiently distinct for placement in the monotypic Saundersilarus. In 2023, this transfer was accepted by the International Ornithologists' Union.
It is threatened by habitat loss, particularly by conversion of saltmarsh to agricultural land or fish farms, and industrial development including oil extraction. One of its few remaining strongholds are the Yancheng Coastal Wetlands, which hosts about 20% of the world's population.
Saunders's gull is named after the British ornithologist Howard Saunders. This is a very small species of gull with a length of just 33 cm (13 in) and, among gulls, only the little gull is smaller. Adults have a black hood and nape during the breeding season. It is very pale with a white body and tail... Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Saunders's Gull sighting in Tokyo on a given day, based on 192 verified sightings from GBIF citizen-science data. It is the 115th most-seen of the 229 birds we can rate there. Over three days the chance rises to under 5%, and over a week to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Saunders's Gull in Tokyo on a given day, so our monthly data shows no clear season.
6th of 8
Of the 8 cities where we can rate Saunders's Gull sightings, Tokyo ranks 6th at under 5%. The best odds are in Quanzhou (China, about 10%), Dalian (China, about 10%) and Busan (South Korea, under 5%).
GBIF citizen-science records
It is estimated from how often the Saunders's Gull is recorded against all the birds logged in Tokyo (192 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.
