The Collaborative International Dictionary of English v.0.48:

Saddleback \Sad"dle*back`\, n.
   1. Anything saddle-backed; esp., a hill or ridge having a
      concave outline at the top.
      [1913 Webster]

   2. (Zool.)
      (a) The harp seal.
      (b) The great blackbacked gull (Larus marinus).
      (c) The larva of a bombycid moth (Empretia stimulea)
          which has a large, bright green, saddle-shaped patch
          of color on the back.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Swartback \Swart"back`\, n. (Zool.)
   The black-backed gull (Larus marinus); -- called also
   swarbie. [Prov. Eng.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Waggel \Wag"gel\ (w[a^]g"g[e^]l), n. (Zool.)
   The young of the great black-backed gull (Larus marinus),
   formerly considered a distinct species. [Prov. Eng.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cob \Cob\, n. [Cf. AS. cop, copp, head, top, D. kop, G. kopf,
   kuppe, LL. cuppa cup (cf. E. brainpan), and also W. cob tuft,
   spider, cop, copa, top, summit, cobio to thump. Cf. Cop
   top, Cup, n.]
   1. The top or head of anything. [Obs.] --W. Gifford.
      [1913 Webster]

   2. A leader or chief; a conspicuous person, esp. a rich
      covetous person. [Obs.]
      [1913 Webster]

            All cobbing country chuffs, which make their bellies
            and their bags their god, are called rich cobs.
                                                  --Nash.
      [1913 Webster]

   3. The axis on which the kernels of maize or indian corn
      grow. [U. S.]
      [1913 Webster]

   4. (Zool.) A spider; perhaps from its shape; it being round
      like a head.
      [1913 Webster]

   5. (Zool.) A young herring. --B. Jonson.
      [1913 Webster]

   6. (Zool.) A fish; -- also called miller's thumb.
      [1913 Webster]

   7. A short-legged and stout horse, esp. one used for the
      saddle. [Eng.]
      [1913 Webster]

   8. (Zool.) A sea mew or gull; esp., the black-backed gull
      (Larus marinus). [Written also cobb.]
      [1913 Webster]

   9. A lump or piece of anything, usually of a somewhat large
      size, as of coal, or stone.
      [1913 Webster]

   10. A cobnut; as, Kentish cobs. See Cobnut. [Eng.]
       [1913 Webster]

   11. Clay mixed with straw. [Prov. Eng.]
       [1913 Webster]

             The poor cottager contenteth himself with cob for
             his walls, and thatch for his covering. --R. Carew.
       [1913 Webster]

   12. A punishment consisting of blows inflictod on tho
       buttocas with a strap or a flat piece of wood. --Wright.
       [1913 Webster]

   13. A Spanish coin formerly current in Ireland, worth abiut
       4s. 6d. [Obs.] --Wright.
       [1913 Webster]

   Cob coal, coal in rounded lumps from the size of an egg to
      that of a football; -- called also cobbles. --Grose.

   Cob loaf, a crusty, uneven loaf, rounded at top. --Wright.

   Cob money, a kind of rudely coined gold and silver money of
      Spanish South America in the eighteenth century. The coins
      were of the weight of the piece of eight, or one of its
      aliquot parts.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Larus marinus
    n 1: white gull having a black back and wings [syn: black-
         backed gull, great black-backed gull, cob, Larus
         marinus]