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 Manu National Park on a given day, based on 131 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 351st most-seen of the 641 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.
July–August and November
In those months about 10% of wildlife watchers report a White-rumped Sirystes in Manu National Park on a given day, against under 5% in September–October and December–June, 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.
2nd of 4
Of the 4 parks where we can rate White-rumped Sirystes sightings, Manu National Park ranks 2nd at under 5%. The best odds are in Tambopata National Reserve (Peru, about 10%).
Same family: Tyrannidae
The closest relatives of the White-rumped Sirystes that you can see in Manu National Park (family Tyrannidae, Tyrant Flycatchers) are Social Flycatcher (about 40%), Tropical Kingbird (about 40%) and Great Kiskadee (about 30%), 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 Manu National Park (131 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.
