The "Field Sparrow" can be distinguished from other sparrows by the fact that it has no streaking of any kind on its little buff breast. As its name implies, the "Field Sparrow" is an inhabitant of "open spaces", but so shy, it is not easily observed while foraging on the ground among overgrown weeds and vegetation. The best way to spy on this allusive bird is while it sits atop a bush or fence post singing its heart out to the beauty of creation.
From North Dakota southward and eastward, wherever cultivated farmland has returned to nature, these sparrows move in to breed and set up housekeeping.
Calls or song.
The "Field Sparrow" is illustrious for its plaintive songs of almost "pure-tone". These consist of long, downward slurred whistles followed by one or more rapid trills, "swee-swee-swee-swee-wee-wee-wee-wee". Pairs communicate with each another while foraging through deep grass with a common "chip" and "seep".
Population and distribution.
During Fall migration to the Gulf of Mexico, "Field Sparrows" join other flock of mixed sparrows.
The female weaves a nest of dried grass, lined with softer green grass on, or near the ground.