Northern Pintail (Anas acuta) duck
This is a large duck, and the male's long central tail feathers give rise to the species' English and scientific names. Both sexes have blue-grey bills and grey legs and feet. The drake is more striking, having a thin white stripe running from the back of its chocolate-colored head down its neck to its mostly white undercarriage. The drake also has attractive grey, brown, and black patterning on its back and sides.
Photographed at the Lincoln Park Zoo pond