Mackenziaena leachii
Silhouette: Sheatherius · PhyloPic
In 3 days <5% in a week ~10%
The large-tailed antshrike (Mackenziaena leachii) is a species of bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds". It is found in Argentina, Brazil, Paraguay, and Uruguay. The large-tailed antshrike shares genus Mackenziaena with the tufted antshrike (M. severa) though there is some doubt about how closely they are related. Both species are monotypic.
The large-tailed antshrike is a large dark antbird with a long full tail. It is 25 to 26 cm (9.8 to 10 in) long and weighs 58 to 62 g (2.0 to 2.2 oz). The species exhibits significant sexual dimorphism, though both sexes have a moderately long black bill with a hook at the end like true shrikes. Adult males are mostly black with small white spots on their crown, nape, upperparts, and sides. Adult females are mostly brownish black. Their forehead is rufous, their crown is rufous with black edges on its feathers, their upperparts have pale buff spots, and their wings have pale buff bars. Their underparts are thickly spotted with buffy white and their crissum is barred with buffy white. Subadults resemble adult females but their spots are larger and their belly... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Itatiaia National Park | 🇧🇷 Brazil | |
| 2 | Iguazú National Park | 🇦🇷 Argentina | |
| 3 | Iguaçu National Park | 🇧🇷 Brazil | |
| 4 | Serra dos Órgãos National Park | 🇧🇷 Brazil |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | São Paulo | 🇧🇷 Brazil |
Rare
Under 5% of wildlife watchers report a Large-tailed Antshrike sighting in Iguazú National Park on a given day, based on 58 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 242nd most-seen of the 343 birds we can rate there. Over three days the chance rises to under 5%, and over a week to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Large-tailed Antshrike in Iguazú National Park on a given day, so our monthly data shows no clear season.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Large-tailed Antshrike sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 4
Of the 4 parks where we can rate Large-tailed Antshrike sightings, Iguazú National Park ranks 2nd at under 5%. The best odds are in Itatiaia National Park (Brazil, about 10%).
GBIF citizen-science records
It is estimated from how often the Large-tailed Antshrike is recorded against all the birds logged in Iguazú National Park (58 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.
