Vocal convergence and social proximity shape the calls of the most basal Passeriformes, New Zealand Wrens.

Despite extensive research on avian vocal learning, we still lack a general understanding of how and when this ability evolved in birds. As the closest living relatives of the earliest Passeriformes, the New Zealand wrens (Acanthisitti) hold a key phylogenetic position for furthering our understanding of the evolution of vocal learning because they share a common ancestor with two vocal learners: oscines and parrots. However, the vocal learning abilities of New Zealand wrens remain unexplored.

Wild Birds Learn Songs from Experimental Vocal Tutors.

In eight groups of animals, including humans and songbirds, juveniles are understood to learn vocalizations by listening to adults [1-4]. Experimental studies of laboratory-reared animals support this hypothesis for vocal learning [5-7], yet we lack experimental evidence of vocal learning in wild animals. We developed an innovative playback technology involving automated loudspeakers that broadcast songs with distinctive acoustic signatures.