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

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

Gerrit Vyn / Orange-crowned warbler (Vermivora celata celata) Seward Peninsula, Alaska, USA. June.