What is "golden-crested wren"

Goldcrest \Gold"crest`\ (g[=o]ld"kr[e^]st`), n. (Zo["o]l.) 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.

Kinglet \King"let\, n.

1. A little king; a weak or insignificant king.
   --Carlyle.

2. (Zo["o]l.) Any one of several species of small singing birds of the genus Regulus and family Sylviid[ae].

   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.

n. The goldcrest, ''Regulus regulus''