black catbird Melanoptila glabrirostris

Slender-billed, glossy black bird of humid forest, woodland, thickets, and overgrown clearings; shape and habits like Gray Catbird of North America. Common on Cozumel Island, but generally uncommon to rare on the Yucatan mainland. Often sings from a prominent perch, but otherwise rather retiring and easily overlooked, mainly at low levels in bushes; also hops on the ground, flipping and fanning its tail. Told from other black songbirds in its geographic range by habits and slender bill.