Myrmotherula assimilis
Silhouette: Sheatherius · PhyloPic
In 3 days ~60% in a week ~90%
The leaden antwren (Myrmotherula assimilis) is a species of bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds". It is found in Bolivia, Brazil, Colombia, and Peru. The leaden antwren was described by the Austrian ornithologist August von Pelzeln in 1868 and given its current binomial name Myrmotherula assimilis.
The leaden antwren is 9 to 10.5 cm (3.5 to 4.1 in) long and weighs 8.2 to 10.5 g (0.29 to 0.37 oz). It is a small bird with a short tail. Adult males of the nominate subspecies have a medium gray crown, back, and rump with a hidden white patch between the shoulders. Their wing coverts are medium gray with white tips and their flight feathers are dusky. Their tail is gray. Their underparts are pale gray that is palest on the throat. Adult females have a medium brownish gray to olive gray crown, back, and rump with a hidden white patch between the shoulders. Their wings are olive brown with pale buff or whitish buff tips on the coverts. Their tail is gray or dusky. Their face is pale gray... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Anavilhanas National Park | 🇧🇷 Brazil | |
| 2 | Amacayacu National Natural Park | 🇨🇴 Colombia |
Possible
About 30% of wildlife watchers report a Leaden Antwren sighting in Anavilhanas National Park on a given day, based on 105 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 41st most-seen of the 291 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.
May
In that month about 40% of wildlife watchers report a Leaden Antwren in Anavilhanas National Park on a given day, against about 10% in March, the lowest month.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Leaden Antwren sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate Leaden Antwren sightings, Anavilhanas National Park has the highest daily chance: about 30%. Next come Amacayacu National Natural Park (Colombia, under 5%).
Same genus: Myrmotherula
The closest relatives of the Leaden Antwren that you can see in Anavilhanas National Park (genus Myrmotherula, Typical Antwrens) are Klages's Antwren (about 30%) and Cherrie's Antwren (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Leaden Antwren is recorded against all the birds logged in Anavilhanas National Park (105 verified sightings from 2019 to 2026), 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.
