regulus cristatus

from The Collaborative International Dictionary of English v.0.48

Goldcrest \Gold"crest`\ (g[=o]ld"kr[e^]st`), n. (Zool.)
   The European golden-crested kinglet ({Regulus cristatus}, or
   {Regulus regulus}); -- called also {golden-crested wren}, and
   {golden wren}. The name is also sometimes applied to the
   American golden-crested kinglet. See {Kinglet}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Kinglet \King"let\, n.
   1. A little king; a weak or insignificant king. --Carlyle.
      [1913 Webster]

   2. (Zool.) Any one of several species of small singing birds
      of the genus {Regulus} and family {Sylviid[ae]}.
      [1913 Webster]

   Note: The golden-crowned kinglet ({Regulus satrapa}), and the
         rubycrowned kinglet ({Regulus calendula}), are the most
         common American species. The common English kinglet
         ({Regulus cristatus}) is also called {golden-crested
         wren}, {moonie}, and {marigold finch}. The kinglets are
         often popularly called {wrens}, both in America and
         England.