Assertion: raven's vocalization | /r/ObjectUse | used in breeding
Facets:
value: by the male
type: OTHER
Source sentences:
text: Bird song is best considered the vocalization that is used in courtship and breeding, chiefly by the male, to advertise that he is ready to mate, to attract the female and perhaps stimulate her sexually, to keep the pair together, and to inform rival males that he has established a territory from which they will be excluded.