Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Worthen's Sparrow (Spizella wortheni) is a species of American sparrow that is endemic to northeastern Mexico. It was first described by Ridgway in 1884 and named for American naturalist Charles K. Worthen This small bird was listed as endangered by the IUCN in 1994. Spizella wortheni can range in length from 12.5–14 cm. It is identifiable by its distinctive head pattern. It has a grey head with a rufous crown, a brown postocular stripe and a pink bill. It has grey-brown upperparts, with dark brown streaks. It has a grey bottom, and dark brown wings and tail. Its wings are "edged paler, with broad whitish to pale buff wing-bar, buffy-rufous tertial and secondary edging, and greyish lesser coverts."

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