Brothers and sisters (9) Barn owl (9) Food (8) Communication (8) Parents (8) Negotiation (8) Competition (8) aliment (7) Food (7) Communication (7) Owls (6) Hunger (6) Animals (6) grange (6) spectacle (4) besoin (4) investissement (4) Adversaries (4) Enemies (4) Time (4) Animals--Infancy (4) Age (4) Family (4) temps (durée) (3) comportement (3) information (3) famille (3) coût (3) âge (3) Dynamics (3)