The Sulphury Flycatcher, known scientifically as Tyrannopsis sulphurea, is a robust passerine bird that presents itself with a rather striking appearance. Adults typically measure around 20.3 cm in length and weigh approximately 54 grams. They exhibit a dark grey head and neck, with a secretive yellow crown stripe that often remains concealed. The upperparts of this bird are an olive hue, while the wings and tail bear a brown coloration. The underparts are a vibrant yellow, with a subtle greenish tint adorning the upper breast and a contrasting white throat. A short and broad black bill completes their distinctive profile.
When attempting to distinguish the Sulphury Flycatcher from its avian counterparts, note its stocky build and shorter stature compared to similar species. The bill is notably shorter and broader than that of many other flycatchers. The concealed yellow crown stripe, when visible, is a key identifying feature.
This species has a strong affinity for savannah regions where moriche palms are prevalent. It is within these palm crowns that the Sulphury Flycatcher often chooses to reside and breed.
The Sulphury Flycatcher is a localized resident breeder with a range that includes Trinidad, the Guianas, Venezuela, Amazonian Peru, northern Bolivia, and Brazil.
With a preference for high perches in moriche palms, the Sulphury Flycatcher is an adept hunter, sallying forth from its vantage point to catch insects in mid-flight. It is also known to supplement its diet with berries and other fruits.
The vocalizations of the Sulphury Flycatcher are quite distinctive, characterized by a loud squealing "jweeez," which markedly differs from the twittering calls of the Tropical Kingbird.
Nesting occurs within the crowns of moriche palms, where an open cup of sticks serves as the foundation for rearing young. The typical clutch consists of two cream-colored eggs, adorned with brown blotches.
The Tropical Kingbird may be mistaken for the Sulphury Flycatcher; however, the latter can be identified by its shorter and more robust build, as well as its shorter bill.
Insects form the primary component of the Sulphury Flycatcher's diet, although it is known to consume berries and other fruits as well.
The Sulphury Flycatcher is currently classified as Least Concern by the IUCN, indicating that, at present, there are no immediate threats to its population numbers.