puffinus major

from The Collaborative International Dictionary of English v.0.48

Hagdon \Hag"don\ (h[a^]g"d[o^]n), n. (Zool.)
   One of several species of sea birds of the genus {Puffinus};
   esp., {Puffinus major}, the greater shearwarter, and
   {Puffinus Stricklandi}, the black hagdon or sooty shearwater;
   -- called also {hagdown}, {haglin}, and {hag}. See
   {Shearwater}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Shearwater \Shear"wa`ter\, n. [Shear + water; cf. G.
   wassersherer; -- so called from its running lightly along the
   surface of the water.] (Zool.)
   Any one of numerous species of long-winged oceanic birds of
   the genus {Puffinus} and related genera. They are allied to
   the petrels, but are larger. The Manx shearwater ({Puffinus
   Anglorum}), the dusky shearwater ({Puffinus obscurus}), and
   the greater shearwater ({Puffinus major}), are well-known
   species of the North Atlantic. See {Hagdon}.
   [1913 Webster]