A fairly large gray-and-white songbird with a long tail, slightly curved bill, black mask, and blotchy gray vest. Endemic to Galápagos. Found only on San Cristóbal Island, where it is the only mockingbird. Adult may have a faint, dark mustache; juvenile has a heavily spotted breast. Uncommon and usually encountered alone or in pairs, in areas with scattered trees and cacti; tends to avoid tall, dense forest.