title: Aggressive behavior in immature ducklings.
mesh_terms: D000374:Aggression; D000818:Animals; D000831:Animals, Newborn / Q000254:growth & development*; D001522:Behavior, Animal; D004372:Ducks / Q000254:growth & development*; D004924:Escape Reaction; D005106:Exploratory Behavior; D005239:Fear; D006801:Humans; D007173:Imprinting, Psychological; D009039:Motion Perception; D012919:Social Behavior