kinglet
noun
king·let ˈkiŋ-lət 
1
: any of several small birds (genus Regulus) that are related to the gnatcatchers
2
: a weak or petty king
Example Sentences
Recent Examples on the Web This is the prime time to find migrating fall warblers, vireos, and kinglets. 
courant.com, 28 Aug. 2019 Sparrows, ovenbirds, juncos, warblers, kinglets, and creepers are just some of the species on the casualty list. Babak Tafreshi, National Geographic, 3 Apr. 2019
courant.com, 28 Aug. 2019 Sparrows, ovenbirds, juncos, warblers, kinglets, and creepers are just some of the species on the casualty list. Babak Tafreshi, National Geographic, 3 Apr. 2019 Word History
First Known Use
1603, in the meaning defined at sense 2
Kids Definition
kinglet
noun
king·let ˈkiŋ-lət
: a small active bird especially of wooded areas