Sirystes albocinereus
Silhouette: Emily Willoughby · PhyloPic
In 3 days ~10% in a week ~20%
The white-rumped sirystes (Sirystes albocinereus), is a species of bird in the family Tyrannidae, the tyrant flycatchers. It is found in Bolivia, Brazil, Colombia, Ecuador, Peru, and Venezuela. The white-rumped sirystes was originally described as a species with its current binomial Sirystes albocinereus. By the 1930s it was generally treated as a subspecies of S. sibilator, at that time called simply "sirystes" and now called the sibilant sirystes. As a result of a study published in 2013, "sirystes" was split into four species, returning S. albocinereus to species status.
The white-rumped sirystes is monotypic. The white-rumped sirystes is 18 to 19 cm (7.1 to 7.5 in) long and weighs 24 to 32 g (0.85 to 1.1 oz). The sexes have the same plumage. Adults have a black crown with a slight crest. The rest of their face is slate gray. Their nape and back are mottled gray with a large white rump patch. Their wings are blackish with pale gray edges on the coverts and white edges on the inner flight feathers. Their tail is long, blackish, and has a square tip. Their throat and breast are pale gray that becomes white on the belly. They have a coffee... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Tambopata National Reserve | 🇵🇪 Peru | |
| 2 | Manu National Park | 🇵🇪 Peru | |
| 3 | Yasuní National Park | 🇪🇨 Ecuador | |
| 4 | Cuyabeno Wildlife Reserve | 🇪🇨 Ecuador |
Rare
Under 5% of wildlife watchers report a White-rumped Sirystes sighting in Yasuní National Park on a given day, based on 90 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 310th most-seen of the 533 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.
August
In that month about 10% of wildlife watchers report a White-rumped Sirystes in Yasuní National Park on a given day, against under 5% in September to July, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most White-rumped Sirystes sightings with a recorded time, and about 8 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 White-rumped Sirystes sightings, Yasuní National Park ranks 3rd at under 5%. The best odds are in Tambopata National Reserve (Peru, about 10%) and Manu National Park (Peru, under 5%).
Same family: Tyrannidae
The closest relatives of the White-rumped Sirystes that you can see in Yasuní National Park (family Tyrannidae, Tyrant Flycatchers) are Tropical Kingbird (about 50%), Great Kiskadee (about 50%) and Lesser Kiskadee (about 40%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the White-rumped Sirystes is recorded against all the birds logged in Yasuní National Park (90 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.
