Claudio Contreras / Long-billed gnatwren (Ramphocaenus melanurus) perched on branch. Las Guacamayas Biological Station, Laguna del Tigre National Park, El Peten, Guatemala.

Bruno D'Amicis / Cuban gnatcatcher (Polioptila lembeyei) Humboldt National Park. Endemic to Cuba.

Cyril Ruoso / Tropical gnatcatcher (Polioptila plumbea pavirostris) Chaparri Ecological Reserve, Peru

Gabriel Rojo / Masked gnatchatcher (Polioptila dumicola) Ibera Marshes, Corrientes Province, Argentina

Visuals Unlimited / Blue gray Gnatcatcher (Polioptila caerulea) perched on a Redbud branch, Ontario, Canada.

Visuals Unlimited / Blue gray Gnatcatcher (Polioptila caerulea) perched on a Redbud branch, Ontario, Canada.

Visuals Unlimited / Blue gray Gnatcatcher (Polioptila caerulea) perched on a branch in south Texas, USA.

Brent Stephenson / Tropical Gnatcatcher (Polioptila plumbea) perched on a small branch. Coiba Island, Panama, September.

Marie Read / Blue-gray Gnatcatcher (Polioptila caerulea), male in breeding plumage, Wichita Mountains National Wildlife Refuge, Oklahoma, USA

Marie Read / California Gnatcatcher (Polioptila californica), male singing amid yellow Bladderpod (Isomeris arborea) flowers, California, USA. The bird is listed as threatened under the United States Endangered Sp...

Marie Read / California Gnatcatcher (Polioptila californica), male, California, USA. A species listed as threatened under the United States Endangered Species Act. (Digitally retouched - distracting sticks remove...

Rolf Nussbaumer / Blue-gray Gnatcatcher {Polioptila caerulea} juvenile, Rio Grande Valley, Texas, USA

Mike Potts / Cuban gnatcatcher {Polioptila lembeyei} on cactus, Cuba

Mike Potts / Cuban gnatcatcher {Polioptila lembeyei} on cactus, Cuba

Gabriel Rojo / Masked gnatcatcher {Polioptila dumicola} Argentina

Gabriel Rojo / Masked gnatcatcher {Polioptila dumicola} Argentina

Visuals Unlimited / California Gnatcatcher (Polioptila californica), San Diego County, California, USA.