Warble-duets seem linked to active territory-defense. Physical-fights in the wild were always preceded by warble-duets. Playback-experiments also showed that parrots increased warble-duets when ...

The tooth-billed pigeon, which is sometimes referred to as “the little dodo” of the Pacific, is a variety of fowl indigenous only on the islands of Samoa. For more than a decade, it was also thought ...