What is "regulus satrapa"

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.