Tolmomyias is a genus of Neotropical bird

Bird

Birds are feathered, winged, bipedal, endothermic , egg-laying, vertebrate animals. Around 10,000 living species and 188 families makes them the most speciose class of tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic. Extant birds range in size from...

s in the Tyrannidae family. They are notoriously difficult to identify, except by voice. Their taxonomy

Taxonomy

Taxonomy is the science of identifying and naming species, and arranging them into a classification. The field of taxonomy, sometimes referred to as "biological taxonomy", revolves around the description and use of taxonomic units, known as taxa...

 is complex and it is likely some of the below "species" (notably the Yellow-olive Flatbill) actually include several species level taxa. The name flatbill

Flatbill

Flatbill refers to the members of two genera of the family Tyrannidae:*Ramphotrigon*RhynchocyclusIn recent years it has also frequently been used for the members of another genus in the family Tyrannidae:*Tolmomyias...

 is often replaced by the more general flycatcher

Flycatcher

There are various families of bird termed flycatchers:* The Old World flycatchers, Muscicapidae* The Tyrant flycatchers, Tyrannidae* The Monarch flycatchers, Dicruridae* The Silky-flycatchers, Ptilogonatidae* The Fairy flycatchers, Stenostiridae...

. They are relatively thickset birds with proportionally large heads and, as suggested by their name, flat bills. All have a primarily yellow-green plumage

Plumage

Plumage refers both to the layer of feathers that cover a bird and the pattern, colour, and arrangement of those feathers. The pattern and colours of plumage vary between species and subspecies and can also vary between different age classes, sexes, and season. Within species there can also be a...

 with distinct edging to the wings, and the crown is often grey.

Species

• Yellow-margined Flatbill, Tolmomyias assimilis.
  • Zimmer's Flatbill, Tolmomyias (assimilis) assimilis.
  • Yellow-margined Flatbill, Tolmomyias (assimilis) flavotectus.
• Grey-crowned Flatbill, Tolmomyias poliocephalus.
• Yellow-olive Flatbill, Tolmomyias sulphurescens.
• Orange-eyed Flatbill, Tolmomyias traylori.
• Yellow-breasted Flatbill, Tolmomyias flaviventris.
  • Ochre-lored Flatbill, Tolmomyias (flaviventris) flaviventris.
  • Olive-faced Flatbill, Tolmomyias (flaviventris) viridiceps.