Loic Poidevin / Yellow warbler (Dendroica petechia) at nest, Pointe Pelee, Ontario, Canada, May

Steve Gettle / Cape May Warbler (Setophaga tigrina) male calling, Crane Creek State Park, Ohio

Steve Gettle / Chestnut-sided Warbler (Setophaga pensylvanica) male, Crane Creek State Park, Ohio

Tom Vezo / Cape May Warbler (Setophaga tigrina) male, Rio Grande Valley, Texas

Tom Vezo / Blackpoll Warbler (Setophaga striata) male, portrait, Rio Grande Valley, Texas

Tom Vezo / Magnolia Warbler {Dendroica magnolia} perching on branch in blossom, Long Island, NY, USA.

Rolf Nussbaumer / Chestnut sided warbler {Dendroica pennsylvanica} Texas, USA

Rolf Nussbaumer / Black throated green warbler, male {Dendroica virens} Texas, USA.

Rolf Nussbaumer / Black throated green warbler, female {Dendroica virens} Texas, USA.

Alan Murphy/ BIA / Cape May Warbler (Setophaga tigrina) male, Texas

Alan Murphy/ BIA / American Redstart (Setophaga ruticilla) male, Texas

Karine Aigner / Portrait of scientist Nathan Cooper holding radio-telemetry equipment to track Kirtland's warbler (Setophaga kirtlandii). Cat Island, Bahamas. April 2017.