Larus belcheri
Silhouette: Juan Carlos Jerí · PhyloPic
In 3 days ~70% in a week ~90%
Belcher's gull (Larus belcheri), also known as the band-tailed gull, is a bird in the family Laridae found along the Pacific coast of South America. It formerly included the very similar Olrog's gull as a subspecies, but that bird occurs on the Atlantic coast of South America and is now accepted as a separate species Larus atlanticus. Belcher's gull is a medium-sized gull with a blackish mantle, white head and underparts, a black band on the otherwise white tail, and a yellow bill with a red and black tip. Non-breeding adults have a brownish-black head and a white eye-ring. The name commemorates the British explorer Sir Edward Belcher, who performed survey work on the Pacific coast of South America.
Belcher's gull is 48–54 centimetres (19–21 in), with a wingspan of about 120 cm (47 in). The sexes are similar in appearance, and in the breeding season, the adult has a white head, very pale grey neck, and white underparts. The mantle and back are greyish-black, and the tail is white with a broad black subterminal band and a white trailing edge. The wing coverts and primaries are black and the secondaries dark grey with white tips. The eye is black, the bill yellow with... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Lima | 🇵🇪 Peru |
Possible
About 30% of wildlife watchers report a Belcher's Gull sighting in Lima on a given day, based on 2,822 verified sightings from GBIF citizen-science data. It is the 22nd most-seen of the 171 birds we can rate there. Over three days the chance rises to about 70%, and over a week to about 90%, if each day is a fresh chance.
July
In that month about 50% of wildlife watchers report a Belcher's Gull in Lima on a given day, against about 20% in December and January, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Belcher's 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.
Only Lima, in our data
Lima is the only city on Wallace's Line with enough records to rate Belcher's Gull sightings: about 30% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Belcher's Gull is recorded against all the birds logged in Lima (2,822 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.
