any of a genus (Puffinus, family Procellariidae) of black-and-white tubenose sea birds that skim the water in flight
See shearwater in American Heritage Dictionary 4
(shîrˈwôˌtər, -wŏtˌər)
noun
Any of various oceanic birds of the genus Puffinus, having a short hooked bill with tube-shaped nostrils and long slender wings that appear to shear the water as the bird flies along the surface.