Alan Murphy/ BIA / Orange-crowned Warbler (Oreothlypis celata) among red berries, Texas

Rolf Nussbaumer / Orange-crowned Warbler (Vermivora celata), adult on autumn leaves of Bigtooth Maple (Acer grandidentatum), Hill Country, Central Texas, USA, November.

Alan Murphy/ BIA / Orange-crowned Warbler (Oreothlypis celata), Texas

Karine Aigner / Portrait of a Orange-crowned warbler, (Vermivora celata) with white background, Block island, Rhode Island, USA. Bird caught during scientific research.

E.J. Peiker/ BIA / Orange-crowned Warbler (Oreothlypis celata), Texas

Alan Murphy/ BIA / Orange-crowned Warbler (Oreothlypis celata), Texas

Nick Saunders/ BIA / Orange-crowned Warbler (Oreothlypis celata), Saskatchewan, Canada

Tim Zurowski/ BIA / Orange-crowned Warbler (Oreothlypis celata), British Columbia, Canada

Rolf Nussbaumer / Orange-crowned warbler (Vermivora celata), adult perched on icy branch of Christmas cholla (Cylindropuntia leptocaulis), Hill Country, Texas, USA. January

Rolf Nussbaumer / Orange-crowned Warbler (Vermivora celata), adult perched on icy branch of Yaupon Holly (Ilex vomitoria) with berries, Hill Country, Texas, USA. February

Rolf Nussbaumer / Orange-crowned Warbler (Vermivora celata), adult fluffed up perched on icy branch of Possum Haw Holly (Ilex decidua) with berries, Hill Country, Texas, USA. February

Alan Murphy/ BIA / Orange-crowned Warbler (Oreothlypis celata), Texas