Non-Vocal Behaviors Are More Frequent During the Decisive Negotiation Phases in Barn Owl Siblings.

Animals produce vibrations or noises by means of body movements, which can play a role in communication. These behaviors enhance signal transmission or receiver attention and could be specifically used during turn-taking phases of a reciprocal exchange of signals. In the barn owl , nestlings vocalize one after the other to negotiate which individual will have priority access to the impending prey item to be delivered by the parents.