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Yellow-margined flatbill
Conservation status
Least Concern  (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Passeriformes
Family:	Tyrannidae
Genus:	Tolmomyias
Species:	T. assimilis
Binomial name
Tolmomyias assimilis (Pelzeln, 1868)

The yellow-margined flatbill or Zimmer's flatbill (Tolmomyias assimilis) is a species of bird in the tyrant flycatcher family Tyrannidae. It is found in humid forest in southern Central America, and the Chocó and Amazon in South America.

There are significant differences (notably voice) between the populations east and west of the Andes, leading to suggestions that the two should be regarded as separate species, in which case the population west of the Andes retains the English name yellow-margined flatbill (or flycatcher) but with the scientific name T. flavotectus, while the Amazonian population retains the scientific name T. assimilis but with the English name Zimmer's flatbill (or flycatcher).

Both population closely resemble the yellow-olive flatbill, and are typically best separated from that species by voice.

References

1. BirdLife International (2016). "Tolmomyias assimilis". IUCN Red List of Threatened Species. 2016: e.T103680514A93739604. doi:10.2305/IUCN.UK.2016-3.RLTS.T103680514A93739604.en. Retrieved 16 November 2021.
2. Gill, F.; Wright, M.; Donsker, D. (2009). "IOC World Bird Names (version 2.2)". www.worldbirdnames.org. Retrieved 30 August 2009.

External links

• Xeno-canto: audio recordings of Zimmer's flatbill

Media related to Tolmomyias assimilis at Wikimedia Commons

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• IUCN Red List least concern species
• Tolmomyias
• Birds of the Amazon rainforest
• Birds of the Guiana Shield
• Birds described in 1868
• Taxa named by August von Pelzeln
• Tyrannidae stubs