The yellow-margined flatbill or Zimmer's flatbill is a species of bird in the tyrant flycatcher family Tyrannidae. It is found in every mainland South American country except Argentina, Chile, Paraguay, and Uruguay.
Region
Amazon Basin and northern South America
Typical Environment
Occurs widely in lowland and foothill humid forests, including terra firme, várzea, and secondary growth. It favors edges, vine tangles, bamboo thickets, and light gaps within mature forest. Often found from the understory up to the mid-canopy, especially along streams and clearings. Present in most mainland South American countries except Argentina, Chile, Paraguay, and Uruguay.
Altitude Range
Sea level to 1500 m
Climate Zone
Tropical
Ease of Keeping
Beginner friendly: 1/5
Also known as Zimmer's flatbill, this small tyrant flycatcher is best identified by the yellow edging on its wings and tail and its broad, flattened bill. It often joins mixed-species flocks in the forest understory and midstory, where it gleans insects from foliage. Voice is a key field mark: it gives a series of sharp, whistled notes that differ from similar flatbills.
Temperament
social and active
Flight Pattern
short rapid wingbeats with brief sallies
Social Behavior
Usually seen in pairs or small family groups and frequently joins mixed-species flocks. Builds a long, pendulous, pouch-like nest with a side entrance, often suspended near or over water for protection. Pairs maintain small territories within suitable habitat.
Migratory Pattern
Resident
Song Description
Delivers a series of clear, sharp whistles and piping notes, often given in short, repetitive phrases. Calls are penetrating but not loud, and are key to distinguishing it from similar flatbills. Vocalizations are given regularly at dawn and during active foraging.
