Larus saundersi
In 3 days ~10% in a week ~20%
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 Busan on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 103rd most-seen of the 112 birds we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
January
In that month about 10% of wildlife watchers report a Saunders's Gull in Busan on a given day, against under 5% in February to December, the lowest months. That is one of Busan's driest months, with about 40 mm of rain against 290 mm in July.
3rd of 8
Of the 8 cities where we can rate Saunders's Gull sightings, Busan ranks 3rd at under 5%. The best odds are in Quanzhou (China, about 10%) and Dalian (China, about 10%).
GBIF citizen-science records
It is estimated from how often the Saunders's Gull is recorded against all the birds logged in Busan (6 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.
