Steve Gettle / Great Egret (Ardea alba) in courtship display, North America

Donald M. Jones / Nashville Warbler (Oreothlypis ruficapilla) male calling in spring, western Montana

Winfried Wisniewski / Ruff (Philomachus pugnax) males displaying in rain at lek, Norway

Winfried Wisniewski / Ruff (Philomachus pugnax) male displaying at lek, Varanger Peninsula, Norway

Gerrit Vyn / Subadult male Wild Turkey (Meleagris gallopavo) in alternate (breeding) plumage. Hidalgo County, Texas. March.

Sebastian Kennerknecht / Atlantic Puffin (Fratercula arctica) at nest burrow, Skomer Island National Nature Reserve, Skomer Island, Pembrokeshire, Wales, United Kingdom

Glenn Bartley / Eared Grebe (Podiceps nigricollis), British Columbia, Canada

Walter Soestbergen / Eared Grebe (Podiceps nigricollis) male in breeding plumage, Utrecht, Netherlands

Glenn Bartley / Willow Ptarmigan (Lagopus lagopus) male, Manitoba, Canada

Gerrit Vyn / Western grebe (Aechmophorus occidentalis) in breeding (alternate) plumage, Malheur County, Oregon, USA September

Donald M. Jones / Common Loon (Gavia immer) stretching wings, Troy, Montana

Steve Gettle / Wood Duck (Aix sponsa) male swimming, Lapeer State Game Area, Michigan