Molothrus oryzivorus
Silhouette: Andy Wilson · PhyloPic
In 3 days ~10% in a week ~20%
The giant cowbird (Molothrus oryzivorus) is a large passerine bird in the New World family Icteridae. It breeds from southern Mexico south to northern Argentina, and on Trinidad and Tobago. It may have relatively recently colonised the latter island. It is a brood parasite and lays its eggs in the nests of other birds.
The giant cowbird was formally described in 1788 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's Systema Naturae. He placed it with the orioles in the genus Oriolus and coined the binomial name Oriolus oryzivorus. Gmelin based his account on the "rice bird" from Cayenne that had been described in 1782 by the English ornithologist John Latham in his multi-volume work A General Synopsis of Birds. The specific epithet is from Latin oryza meaning "rice" and -vorus meaning "eating". The giant cowbird is now one of six cowbirds placed in the genus Molothrus that was introduced in 1832 by William Swainson.
Two subspecies are recognised: Wikipedia →
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Santa Cruz de la Sierra | 🇧🇴 Bolivia | |
| 2 | Belém | 🇧🇷 Brazil | |
| 3 | Guayaquil | 🇪🇨 Ecuador | |
| 4 | Barranquilla | 🇨🇴 Colombia | |
| 5 | San Pedro Sula | 🇭🇳 Honduras | |
| 6 | Medellín | 🇨🇴 Colombia | |
| 7 | San José | 🇨🇷 Costa Rica | |
| 8 | Caracas | 🇻🇪 Venezuela | |
| 9 | Panama City | 🇵🇦 Panama | |
| 10 | Bogota | 🇨🇴 Colombia |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Parque das Aves | 🇧🇷 Brazil |
Rare
Under 5% of wildlife watchers report a Giant Cowbird sighting in Guayaquil on a given day, based on 33 verified sightings from GBIF citizen-science data. It is the 96th most-seen of the 167 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.
May and December
In those months about 20% of wildlife watchers report a Giant Cowbird in Guayaquil on a given day, against under 5% in January–April and June–November, the lowest months. Those are among Guayaquil's driest months, with about 30 mm of rain a month against 220 mm in February.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Giant Cowbird sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
3rd of 10
Of the 10 cities where we can rate Giant Cowbird sightings, Guayaquil ranks 3rd at under 5%. The best odds are in Santa Cruz de la Sierra (Bolivia, about 10%) and Belém (Brazil, under 5%).
GBIF citizen-science records
It is estimated from how often the Giant Cowbird is recorded against all the birds logged in Guayaquil (33 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.
