Builder of an immense domed nest of twigs

Wiktionary Word definitions in Wiktionary
n. A small South American bird ((taxlink Anumbius anumbi species noshow=1)) that builds a large and complex nest of twigs and thorns.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Thornbird \Thorn"bird`\, n. (Zo["o]l.) A small South American bird ( Anumbius anumbii ) allied to the ovenbirds of the genus Furnarius ). It builds a very large and complex nest of twigs and thorns in a bush or tree.