The Lark Bunting (Calamospiza melanocorys) is a medium-sized sparrow and the only member of the genus Calamospiza. It breeds in the prairie regions of central Canada and the mid-western United States. Their nest is an open cup on the ground in a grassy area.

These Lark Bunting has a large pale bill and a pale wing patch. The plumage of the adult males in breeding is black except for their white wing patch. Females of the species and immature males appear more sparrow-like, having dark brown upperparts and white underparts, with streaking on the back, breast and flanks. The wings are dark with brown edges.