Kinglet n. : A little king; a weak or insignificant king.

Kinglet n. : Any one of several species of small singing birds of the genus Regulus and family Sylviidae.

Example:
Is it unusual for the following bird to be found near Pittsburgh?

Taxonomy
Kinglets, species, Regulus, birds, feathers, Ruby-crowned Kinglet, free encyclopedia, Regulidae, eggs, Regulus regulus, family status, genus, North America, seven species, plumage, Diet, Regulus satrapa, prehistoric species.

Defination from the web:
kinglets or crests are a small group of birds sometimes included in the Old World warblers, but are frequently given family status because they also resemble the titmice. ... Kinglets range in size from 9 to 11 cm and are amongst the smallest of the passerines, and indeed of all birds. ...