Bachman's sparrow (Peucaea aestivalis), is a small American sparrow that is endemic to the southeastern United States. This species was named in honor of Reverend John Bachman. Adults have rufous brown upperparts and crown with gray and black streaking on the nape, back and primaries. The face is gray with a rufous brown eyestripe. It has a buff colored breast and whitish belly. These are mid-sized New World sparrows, measuring 12.2–16.2 cm (4.8–6.4 in) and weighing 18.4–23 g (0.65–0.81 oz). The song begins as a clear whistle, followed by a short trill.