The Field Sparrow is a small, gentle-looking sparrow of old fields and brushy edges, best identified by its plain face, rusty cap, white eye-ring, and — the clincher — a bright pink bill that stands out against the soft gray-and-rufous plumage. It lacks the bold streaks and marks of many sparrows, giving it a clean, almost blank expression. Unobtrusive and easy to overlook, it is far more often located by its lovely song than by sight.
That song is one of the most pleasant sounds of a Michigan grassland in early summer: a series of clear, sweet whistles that accelerate into a bouncing trill, often compared to a ping-pong ball dropping and coming to rest. Field Sparrows nest low in shrubby, overgrown fields and young shrubland, a habitat that has declined as farmland reverts to forest or is developed, and with it the birds have slowly declined too. They feed mostly on grass and weed seeds, adding insects in the breeding season.
Feeds chiefly on grass and weed seeds gathered from the ground and low plants, switching to insects and their larvae during the breeding season to feed young. It forages in and beneath brushy field vegetation and rarely strays into open lawns or feeders far from cover.
That accelerating series of clear whistles running into a trill — like a ping-pong ball settling to rest — is a male Field Sparrow. It is one of the easiest grassland songs to learn and recognize.
The Field Sparrow has a bright pink bill, a plain face with a white eye-ring, and no dark eye-line, giving it a blank expression. The Chipping Sparrow has a dark bill, a sharp black eye-line, and a white eyebrow.
Field Sparrows depend on shrubby old fields and young shrubland, a habitat that shrinks as farmland grows back into forest or is developed. The loss of these brushy successional areas has driven gradual population declines.
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