Knipolegus cyanirostris
Silhouette: Emily Willoughby · PhyloPic
In 3 days ~10% in a week ~30%
The blue-billed black tyrant (Knipolegus cyanirostris) is a species of bird in the family Tyrannidae, the tyrant flycatchers. It is found in Argentina, Brazil, Paraguay, and Uruguay. The blue-billed black tyrant was formally described in 1818 as Muscicapa cyanirostris, placing it in the Old World flycatcher family. It was later transferred to genus Knipolegus, which was erected in 1826 with it as the type species.
The blue-billed black tyrant is monotypic. The blue-billed black tyrant is 14.5 to 15 cm (5.7 to 5.9 in) long. Adult males are almost entirely glossy black but for faint white edges on the underside of their remiges. Adult females have mostly rufous-brown upperparts. Their crown is a brighter rufous, their rump rufous, and their tail coverts bright cinnamon. Their wings are blackish with buff to cinnamon edges on the coverts that show as two wing bars. Their tail is dusky with rufous edges to the feathers. Their underparts are mostly whitish to yellowish white with heavy blackish brown streaks and their crissum is cinnamon-rufous. Males have a bright red iris, a pale blue bill with a black tip, and black legs and feet. Females... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Itatiaia National Park | 🇧🇷 Brazil | |
| 2 | El Palmar National Park | 🇦🇷 Argentina | |
| 3 | Iberá National Park | 🇦🇷 Argentina | |
| 4 | Serra dos Órgãos National Park | 🇧🇷 Brazil |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Buenos Aires | 🇦🇷 Argentina |
Rare
Under 5% of wildlife watchers report a Blue-billed Black-Tyrant sighting in Iberá National Park on a given day, based on 89 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 187th most-seen of the 284 birds we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
May and July–August
In those months about 20% of wildlife watchers report a Blue-billed Black-Tyrant in Iberá National Park on a given day, against under 5% in October to March, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Blue-billed Black-Tyrant 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 4
Of the 4 parks where we can rate Blue-billed Black-Tyrant sightings, Iberá National Park ranks 3rd at under 5%. The best odds are in Itatiaia National Park (Brazil, about 30%) and El Palmar National Park (Argentina, about 20%).
Same family: Tyrannidae
The closest relatives of the Blue-billed Black-Tyrant that you can see in Iberá National Park (family Tyrannidae, Tyrant Flycatchers) are Great Kiskadee (about 80%), Cattle Tyrant (about 70%) and Strange-tailed Tyrant (about 50%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Blue-billed Black-Tyrant is recorded against all the birds logged in Iberá National Park (89 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.
