Scott Leslie / Black-and-white Warbler (Mniotilta varia) male calling in spring, Maine

Rolf Nussbaumer / Black-and-white warbler (Mniotilta varia) male perched on Ivy (Hedera sp) branch. South Padre Island, Texas, USA.

Rolf Nussbaumer / Black-and-white warbler (Mniotilta varia) male perched on branch. South Padre Island, Texas, USA.

Claudio Contreras / Black-and-white Warbler (Mniotilta varia), Ria Celestun Biosphere Reserve, Yucatan Peninsula, Mexico, January

Mike Read / Black and white warbler (Mniotilta varia) during bird ringing, Shore Road, Grand Manan Island, Canada, August.

Gerrit Vyn / Black-and-white Warbler (Mniotilta varia) male perched on branch, in breeding plumage. St. Lawrence County, New York. May

Barry Mansell / Black-and-white Warbler (Mniotilta varia) female on branch. High Island, Texas , USA

Barry Mansell / Black and white warbler {Mniotilta varia} USA

Barry Mansell / Black and white warbler {Mniotilta varia} Texas, USA

Scott Leslie / Black-and-white Warbler (Mniotilta varia) male calling in spring, Maine

Alan Murphy/ BIA / Black-and-white Warbler (Mniotilta varia) female, Texas

Alan Murphy / Black-and-white Warbler (Mniotilta varia) male, Texas

Alan Murphy / Black-and-white Warbler (Mniotilta varia) male, Texas

Alan Murphy / Black-and-white Warbler (Mniotilta varia) male, Texas

Alan Murphy / Black-and-white Warbler (Mniotilta varia) female, Texas

Robert Royse / Black-and-white Warbler (Mniotilta varia) singing male, Ohio

Robert Royse / Black-and-white Warbler (Mniotilta varia) singing male, Ohio

Glenn Bartley / Black-and-white Warbler (Mniotilta varia) singing, Ontario, Canada

Matthew Studebaker / Black-and-white Warbler (Mniotilta varia) male, Michigan

Alan Murphy / Black-and-white Warbler (Mniotilta varia) female, Texas

Scott Leslie / Black-and-white Warbler (Mniotilta varia) male in breeding plumage, Nova Scotia, Canada

Scott Leslie / Black-and-white Warbler (Mniotilta varia) male in breeding plumage, Nova Scotia, Canada

Steve Gettle / Black-and-white Warbler (Mniotilta varia) male, Crane Creek State Park, Ohio

Steve Gettle / Black-and-white Warbler (Mniotilta varia) male, Rifle River Recreation Area, Michigan

Steve Gettle / Black-and-white Warbler (Mniotilta varia) male feeding, Crane Creek State Park, Ohio

Steve Gettle / Black-and-white Warbler (Mniotilta varia) female, Crane Creek State Park, Ohio

Scott Leslie / Black-and-white Warbler (Mniotilta varia) male, Nova Scotia, Canada

Scott Leslie / Black-and-white Warbler (Mniotilta varia) male, Maine

Tom Vezo / Black-and-white Warbler (Mniotilta varia) bathing, Rio Grande Valley, Texas

Tom Vezo / Black-and-white Warbler (Mniotilta varia) female perched on branch, Rio Grande Valley, Texas

Tom Vezo / Black-and-white Warbler (Mniotilta varia) male perched on a branch, Rio Grande Valley, Texas

Tom Vezo / Black-and-white Warbler (Mniotilta varia) male perched on a rock, Rio Grande Valley, Texas

Tom Vezo / Black-and-white Warbler (Mniotilta varia) on nest, Gloversville, New York

Tom Vezo / Black-and-white Warbler (Mniotilta varia) chicks in nest, Adirondack Mountains, New York

Tom Vezo / Black-and-white Warbler (Mniotilta varia) on ground, Gloversville, New York

Scott Leslie / Black-and-white Warbler (Mniotilta varia) male in breeding plumage, Nova Scotia, Canada

Alan Murphy/ BIA / Black-and-white Warbler (Mniotilta varia) male, Texas

Scott Leslie / Black-and-white Warbler (Mniotilta varia) male calling in spring, Maine

Scott Leslie / Black-and-white Warbler (Mniotilta varia) male in spring, Maine

Scott Leslie / Black-and-white Warbler (Mniotilta varia) male in spring, Maine

Nick Saunders/ BIA / Black-and-white Warbler (Mniotilta varia), Saskatchewan, Canada

Glenn Bartley/ BIA / Black-and-white Warbler (Mniotilta varia), Ontario, Canada

Glenn Bartley/ BIA / Black-and-white Warbler (Mniotilta varia), Ontario, Canada

Glenn Bartley/ BIA / Black-and-white Warbler (Mniotilta varia), Ontario, Canada

Scott Leslie / Black-and-white Warbler (Mniotilta varia) female, Nova Scotia, Canada

Scott Leslie / Black-and-white Warbler (Mniotilta varia), Nova Scotia, Canada

Steve Gettle / Black-and-white Warbler (Mniotilta varia) female, Crane Creek State Park, Ohio

Steve Gettle / Black-and-white Warbler (Mniotilta varia), Crane Creek State Park, Ohio