Thalasseus acuflavidus
Silhouette: JJ Harrison (vectorized by T. Michael Keesey) · PhyloPic
In 3 days ~30% in a week ~60%
Cabot's tern (Thalasseus acuflavidus) is a species of bird in subfamily Sterninae of the family Laridae, the gulls, terns, and skimmers. It is found on the coasts of the eastern United States and Middle America, the Caribbean, Trinidad and Tobago, and in every mainland South American country except landlocked Bolivia and Paraguay, though rare in Chile. It is also a vagrant in eastern Canada and western Europe.
Cabot's tern was long placed in genus Sterna but since the early 2000s has been in its present genus Thalasseus. Its further taxonomy is not settled. The American Ornithological Society and the Clements taxonomy have not yet accepted Efe et al. and treat those two taxa as subspecies of the Sandwich tern (T. sandvicensis). BirdLife International's Handbook of the Birds of the World (HBW) follows a different conclusion to Efe et al. than the IOC by merging eurygnathus into acuflavidus but treats the merged taxon as one of two subspecies of... Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Cabot's Tern sighting in Santos on a given day, based on 13 verified sightings from GBIF citizen-science data. It is the 43rd most-seen of the 203 birds we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
August
In that month about 30% of wildlife watchers report a Cabot's Tern in Santos on a given day, against under 5% in January–June and October, the lowest months. That is one of Santos's driest months, with about 40 mm of rain against 210 mm in January.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Cabot's Tern sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 3 cities where we can rate Cabot's Tern sightings, Santos has the highest daily chance: about 10%. Next come Vitória (Brazil, about 10%) and Miami (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Cabot's Tern is recorded against all the birds logged in Santos (13 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.
