a nearly extinct, dark-colored petrel (Pterodroma cahow) of Bermuda
See cahow in American Heritage Dictionary 4
(kə-houˈ)
noun
An earth-burrowing, nocturnal bird (Pterodroma cahow), once abundant in Bermuda but now nearly extinct, with a hooked black beak, brown and white plumage, and a gray underside. Also called Bermuda petrel.