Greater Scaup

Cornell’s All About Birds

Lake Elkhorn
December 29, 2010
Photo by Kurt Schwarz

Lake Elkhorn
December 6, 2018
Photo Sarah Romero

Centennial Park
February 3, 2009
Photo by Kurt Schwarz

Warfields Pond
January 20, 2008
Photo by Kurt Schwarz

Centennial Park
February 3, 2013
Photo by Howard Patterson

While not necessary for common species, it is good to get into the habit of including photographs and recordings/spectrographs so that you do it for uncommon species that require more documentation.