Rolf Nussbaumer / White-crowned Sparrow (Zonotrichia leucophrys) on branches covered in frost, Bosque del Apache National Wildlife Refuge, New Mexico, USA. December 2003

Gabriel Rojo / Rufous collared sparrow {Zonotrichia capensis} El Condorito NP, Argentina

Jan Wegener / Golden-crowned Sparrow (Zonotrichia atricapilla) perched on mossy branch, Vancouver Island, Canada

Nick Hawkins / Volcano junco (Junco vulcani) found only, highlands of the Talamanca mountain range, Costa Rica. Endemic.

Oscar Dewhurst / Rufous-collared sparrow (Zonotrichia capensis) on stone pavement. Cusco, Peru. February

Oliver Hellowell / White crowned sparrow (Zonotrichia leucophrys) in Smoky Mountains, Tennessee, USA. November.

Karine Aigner / Portrait of a White-throated sparrow, (Zonotrichia albicollis) with white background, Block island, Rhode Island, USA. Bird caught during scientific research.

Nick Hawkins / Volcano junco (Junco vulcani) an endemic bird species, Talamanca Range, Talamanca Range-La Amistad Reserves / La Amistad National Park UNESCO Natural World Heritage Site, Costa Rica. Small repro only...

Nick Hawkins / Volcano junco (Junco vulcani) endemic to the southern highlands of Costa Rica.

Bernard Castelein / Rufous-collared sparrow (Zonotrichia capensis) Sajama National Park, altiplano, Bolivia, September

Bernard Castelein / Rufous-collared sparrow (Zonotrichia capensis) Sajama National Park, altiplano, Bolivia, September

Claudio Contreras / White-crowned sparrow (Zonotrichia leucophrys) singing, Laredo Borderlands, Texas, USA. April

Claudio Contreras / White-crowned Sparrow (Zonotrichia leucophrys) perched. Laredo Borderlands, Texas, USA. April

Claudio Contreras / White-crowned sparrow (Zonotrichia leucophrys) perched, Laredo Borderlands, Texas, USA. April

Gerrit Vyn / White-crowned sparrow (Zonotrichia leucophrys) in spring alder. Yukon Delta National Wildlife Refuge, Alaska, USA. May.

Gerrit Vyn / White-crowned sparrow (Zonotrichia leucophrys) foraging on crowberry. Seward Peninsula, Alaska. June.

Gerrit Vyn / Golden-crowned sparrow (Zonotrichia atricapilla) singing in spring. Seward Peninsula, Alaska, USA. May.

Gabriel Rojo / Rufous-collared sparrow (Zonotrichia capensis) chicks in nest on flower, Calden forest, La Pampa, Argentina

Gabriel Rojo / Rufous-collared sparrow (Zonotrichia capensis) perched amongst berries, Calden forest, La Pampa, Argentina.

Gabriel Rojo / Rufous-collared sparrow (Zonotrichia capensis) Calden fores, La Pampa , Argentina

David Tipling / Twitchers gathering to watch White-crowned Sparrow (Zonotrichia leucophrys) at Cley, North Norfolk, England, UK, January 2008.

Visuals Unlimited / Song Sparrow (Melospiza melodia) on log in snow, New York, USA

Visuals Unlimited / White throated Sparrow (Zonotrichia albicollis) male portrait, New York, USA.

Visuals Unlimited / Golden crowned Sparrow (Zonotrichia atricapilla) perched on a branch, Victoria, British Columbia, Canada.

Visuals Unlimited / Golden crowned Sparrow (Zonotrichia atricapilla) perched on a rock, Victoria, British Columbia, Canada.

Visuals Unlimited / Rufous collared Sparrow (Zonotrichia capensis) perched on a branch, Jerusalem Reserve, Central Ecuador.

Visuals Unlimited / Rufous collared Sparrow (Zonotrichia capensis) perched on a branch and singing, Tapichalaca Reserve, Southeast Ecuador.

Visuals Unlimited / Golden crowned Sparrow (Zonotrichia atricapilla) perched on a mossy branch in Victoria, British Columbia, Canada.

Visuals Unlimited / Golden crowned Sparrow (Zonotrichia atricapilla) male perched on a branch in Victoria, British Columbia, Canada.

Visuals Unlimited / Golden crowned Sparrow (Zonotrichia atricapilla) perched on a branch in Victoria, British Columbia, Canada.

Visuals Unlimited / Fox Sparrow (Passerella iliaca) near Victoria, British Columbia, Canada.

Visuals Unlimited / Song Sparrow (Melospiza melodia) North America

Steven Kazlowski / Song Sparrow (Melospiza melodia) on branch with a beak full of dry grass for its nest. Tony Knowles Coastal Trail, Anchorage, south-central Alaska, May.

Loic Poidevin / White crowned sparrow (Zonotrichia leucophtys) Pointe Pelee, Ontario, Canada, May

Loic Poidevin / White crowned sparrow (Zonotrichia leucophtys) feeding on ground, Pointe Pelee, Ontario, Canada, May

Konrad Wothe / Rufous collared Sparrow (Zonotrichia capensis) singing, Costa Rica

Gerrit Vyn / Golden crowned sparrow (Zonotrichia atricapilla) in willow, Seward Peninsula, Alaska, USA May

Loic Poidevin / White throated sparrow (Zonotrichia albicollis) perched, Quebec, Canada, October

Loic Poidevin / White throated sparrow (Zonotrichia albicollis) perched on grass, Quebec, Canada, October

Luiz Claudio Marigo / Rufous-collared sparrow (Zonotrichia capensis) male looking at its own image in car mirror, Atlantic Rainforest of Serrinha do Alambari Environmental Protection Area, Rio de Janeiro State, Southeaster...

B&S Draker / White-crowned Sparrow (Zonotrichia leucophrys) adult on blooming Guayacan (Guaiacum angustifolium). Starr County, Rio Grande Valley, Texas, USA.

B&S Draker / Northern Cardinal (Cardinalis cardinalis) female and White-crowned Sparrow (Zonotrichia leucophrys) eating Possum Haw Holly (Ilex decidua) berries. Bandera, Hill Country, Texas, USA, February.

David Welling / Lincoln's Sparrow (Melospiza / Zonotrichia lincolnii) perching on a lichen covered Mesquite branch, Lower Rio Grande Valley of South Texas, USA

David Welling / Song Sparrow (Melospiza / Zonotrichia melodia) perched on branch, Northern Miojave Desert, California, USA, May

David Welling / Harris's Sparrow (Zonotrichia querula) male in winter plumage, Salton Sea National Wildlife Refuge, California, USA, May

David Welling / Fox Sparrow (Passerella / Zonotrichia iliaca) on ground, Santa Monica Mountains National Recreation Area, California, USA, December

Bryan and Cherry Alexander / Rufous collared sparrow (Zonotrichia capensis) in Ushuaia, Argentina.

Gerrit Vyn / White-crowned Sparrow (Zonotrichia leucophrys) in breeding plumage, on sandy ground, Starr County, Texas, USA, March.