Assertion: songbird | /r/HasAspect | specialized voice box
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Source sentences:
text: Like many songbirdsa species from the oscine (ah-SEEN) group of passerine (PASS-er-een) birds, songbirds (including sparrows, thrushes, and warblers) have a specialized voice box called a syrinx that can produce complex sounds, songbirds must learn their songs rather than developing them instinctively, sparrow nestlings listen closely to nearby males and then use these tutorin songbirds which do not develop their songs instinctively, one of the adults that a young bird listens to as a nestling and models its adult song on songs as templates for their own songs.