Glenn Bartley / Magnolia Warbler (Setophaga magnolia) singing male, Ontario, Canada

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

Gerrit Vyn / Tennessee Warbler (Vermivora peregrina) male perched in a pine tree branch, singing in spring, Cold Lake, Edmonton, Alberta, Canada. May.

Nick Hawkins / Common yellow throat (Geothlypis trichas) male, singing, Anchorage Provincial Park, Grand Manan Island, New Brunswick, Canada, June.

Nick Saunders/ BIA / Wilson's Warbler (Cardellina pusilla) male, Saskatchewan, Canada

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

Nick Saunders/ BIA / Nashville Warbler (Oreothlypis ruficapilla), Saskatchewan, Canada

Nick Saunders/ BIA / Canada Warbler (Cardellina canadensis) female, Saskatchewan, Canada

Nick Saunders/ BIA / Blackpoll Warbler (Setophaga striata), Saskatchewan, Canada

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

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

Mike Read / Northern parula (Setophaga americana) in the hand after ringing, Shore Road, Grand Manan Island, Canada, August.