L. Philadelphia

from The Collaborative International Dictionary of English v.0.48

Gull \Gull\, n. [Of Celtic origin; cf. Corn. gullan, W. gwylan.]
   (Zool.)
   One of many species of long-winged sea birds of the genus
   {Larus} and allied genera.
   [1913 Webster]

   Note: Among the best known American species are the herring
         gull ({Larus argentatus}), the great black-backed gull
         ({L. murinus}) the laughing gull ({L. atricilla}), and
         Bonaparte's gull ({L. Philadelphia}). The common
         European gull is {Larus canus}.
         [1913 Webster]

   {Gull teaser} (Zool.), the jager; -- also applied to certain
      species of terns.
      [1913 Webster]