New Zealand's endemic, duetting kokako ( Callaeas cinerea wilsoni ) produce one of the longest known bird songs (ca 30s) and duets that differ strikingly from those of most duetters in their unusual length and non-repetitive structure, long pauses between component phrases, and the great ...
How, then, could receivers detect whether song comes from a pair or an unpaired bird, and what would be the competitive advantage of duetting if two birds were not necessary to produce full song? We investigated whether an antiphonally duetting species, the kokako, Callaeas cinereus wilsoni ...