Marsh Wren Marsh Wren, Burrage Pond WMA, Halifax, MA, January 12, 2024Canon EOS R5 with Canon 100-500 mm L-series lens with 1.4x Teleconverter; 700 mm; ISO-1250; f/10; 1/1000 sec. This page is for the Marsh Wren (Cistothorus palustris).