Claim: Ardenna contains seven species of shearwater birds, including A. pacifica and A. grisea, with one species found in the Atlantic.
Evidence: The genus contains these seven living species: A. pacifica Wedge-tailed shearwater A. grisea Sooty shearwater or muttonbird A. gravis Great shearwater Atlantic Ardenna is a genus of seabirds, in the family Procellariidae, which comprises a group of medium-sized shearwater species.