Progne tapera
Silhouette: Andy Wilson · PhyloPic
In 3 days ~60% in a week ~90%
The brown-chested martin (Progne tapera) is a species of passerine bird in the family Hirundinidae, the swallows and martins. It is found regularly in Panama and every mainland South American country except Chile. It has been documented as a vagrant in Aruba and Chile and there are unconfirmed reports from the Falkland Islands. It is a casual visitor to Costa Rica and has been recorded in Florida, Massachusetts, and New Jersey.
The brown-chested martin was originally described in 1766 as Hirundo Tapera. It was later moved to genus Progne that had been erected in 1826. However, for much of the twentieth century it was placed by itself in genus Phaeoprogne before being restored to its present Progne.
The brown-chested martin is 16 to 18 cm (6.3 to 7.1 in) long and weighs 30 to 40 g (1.1 to 1.4 oz). The sexes have the same plumage. Adults of the nominate subspecies have a mostly sandy brown head with a white chin and throat. Their upperparts are sandy brown. Their tail is slightly forked; it and their wings are a darker... Wikipedia →
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Buenos Aires | 🇦🇷 Argentina | |
| 2 | Cordoba | 🇦🇷 Argentina | |
| 3 | Rosario | 🇦🇷 Argentina | |
| 4 | Santa Cruz de la Sierra | 🇧🇴 Bolivia | |
| 5 | Campo Grande | 🇧🇷 Brazil | |
| 6 | Montevideo | 🇺🇾 Uruguay | |
| 7 | Porto Alegre | 🇧🇷 Brazil | |
| 8 | Asuncion | 🇵🇾 Paraguay | |
| 9 | Barranquilla | 🇨🇴 Colombia | |
| 10 | Salvador | 🇧🇷 Brazil |
Possible
About 30% of wildlife watchers report a Brown-chested Martin sighting in Santa Cruz de la Sierra on a given day, based on 95 verified sightings from GBIF citizen-science data. It is the 36th most-seen of the 208 birds we can rate there. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
October and December
In those months about 50% of wildlife watchers report a Brown-chested Martin in Santa Cruz de la Sierra on a given day, against about 10% in July to September, the lowest months.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Brown-chested Martin sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 26 cities where we can rate Brown-chested Martin sightings, Santa Cruz de la Sierra ranks 4th at about 30%, level with the leaders once rounded. The best odds are in Buenos Aires (Argentina, about 30%), Cordoba (Argentina, about 30%) and Rosario (Argentina, about 30%).
GBIF citizen-science records
It is estimated from how often the Brown-chested Martin is recorded against all the birds logged in Santa Cruz de la Sierra (95 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.
