Sprat borer

from The Collaborative International Dictionary of English v.0.48
Sprat \Sprat\ (spr[a^]t), n. [OE. sprot, sprotte, D. sprot; akin
   to G. sprotte.] (Zool.)
   (a) A small European herring ({Clupea sprattus}) closely
       allied to the common herring and the pilchard; -- called
       also {garvie}. The name is also applied to small herring
       of different kinds.
   (b) A California surf-fish ({Rhacochilus toxotes}); -- called
       also {alfione}, and {perch}.
       [1913 Webster]

   {Sprat borer} (Zool.), the red-throated diver; -- so called
      from its fondness for sprats. See {Diver}.

   {Sprat loon}. (Zool.)
   (a) The young of the great northern diver. [Prov. Eng.]
   (b) The red-throated diver. See {Diver}.

   {Sprat mew} (Zool.), the kittiwake gull.
      [1913 Webster]
    

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