154976 Balearic Shearwater - Puffinus mauretanicus Wingspan to 87cm Critically endangered seabird. Similar to Manx Shearwater but plumage overall browner. Note projecting legs in flight, and dark undertail coverts. Breeds on Balearic islands. Most of world population moves to Bay of Biscay to moult in summer months, at which time they visit British waters.