Didelphis aurita
Silhouette: Sarah Werning · PhyloPic
In 3 days ~60% in a week ~90%
The big-eared opossum (Didelphis aurita), also known as a saruê, or the gambá, is an opossum species from South America. It is found in Argentina, Brazil and Paraguay. This species, which was considered a population of the common opossum (D. marsupialis) for some time, was originally described as D. azarae by Coenraad Jacob Temminck in 1824, but this name was incorrectly given to the white-eared opossum (D. albiventris) for over 160 years. As such, the name azarae has been abandoned.
Due to carrying offspring, female big-eared opossums tend to stay in smaller areas and reduce their movements. facts and pictures at Animal Diversity Web Diogo Loretto, & Marcus Vinícius Vieira. (2005). The Effects of Reproductive and Climatic Seasons on Movements in the Black-Eared Opossum (Didelphis aurita Wied-Neuwied, 1826). Journal of Mammalogy, 86(2), 287–293. http://www.jstor.org/stable/4094347 Wikipedia →
Recording0:09
Brazil · 2020
© Henry Miller Alexandre · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Serra dos Órgãos National Park | 🇧🇷 Brazil | |
| 2 | Tijuca National Park | 🇧🇷 Brazil | |
| 3 | Iguazú National Park | 🇦🇷 Argentina | |
| 4 | Iguaçu National Park | 🇧🇷 Brazil |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | ARCAS Wildlife Rescue Center Guatemala | 🇬🇹 Guatemala |
No species of the same family or order lives in Niterói, so these are its closest relatives here: other mammals.
Possible
About 20% of wildlife watchers report a Big-eared Opossum sighting in Niterói on a given day, based on 17 verified sightings from GBIF citizen-science data. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
January and November
In those months about 40% of wildlife watchers report a Big-eared Opossum in Niterói on a given day, against under 5% in August, the lowest month. Those are among Niterói's wettest months, with about 210 mm of rain a month against 40 mm in August.
Between 6 and 9 pm
Across all the parks we cover, that three-hour window holds the most Big-eared Opossum sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Yes
Of the 7 cities where we can rate Big-eared Opossum sightings, Niterói has the highest daily chance: about 20%. Next come Rio de Janeiro (Brazil, about 20%) and Salvador (Brazil, about 20%).
GBIF citizen-science records
It is estimated from how often the Big-eared Opossum is recorded against all the mammals logged in Niterói (17 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.
