Black-and-white warblers were abundant northward migrants in south Texas in March, 2003 when I took the photograph of an adult male at Paradise Pond birding area near Corpus Cristi.   The birds with white throats are females or immatures, photographed in Everglades National Park in south Florida, near Riverside, California, and at Big Sur, California.

• Canon 1D Mk. II, 1D4, or 7D2; 500 mm f4 IS lens + 2X converter or 800 mm IS lens with 1.4X converter, electronic flash (2005, 2014, 2015, 2017)
• Canon EOS1v, 500 mm f4 IS lens + 2X converter, electronic flash, Kodak Elite Chrome Extra Color (2003)