| effects of population size on singing behavior of a rare duetting songbird. | although the genetic and ecological effects of population declines in endangered species have been well studied, little is known of the social consequences. changes in signaling behavior may result in disrupted communication and affect both reproductive and conflict-resolution activities. the north island kÅkako (callaeas wilsoni) is an endangered, duetting (i.e., alternating, coordinated singing by mated pairs) songbird endemic to new zealand temperate rain forests. scattered populations (appro ... | 2013 | 22979901 |