The role of stimulus-orientation in eliciting the begging response from newly-hatched chicks of the laughing gull (Larus atricilla).
D000818:Animals; D000831:Animals, Newborn; D001502:Beak; D001522:Behavior, Animal; D001717:Birds; D003118:Color Perception; D003213:Conditioning, Psychological; D004193:Discrimination Learning; D005247:Feeding Behavior; D005556:Form Perception; D007866:Leg; D008027:Light; D009474:Neurons / Q000502:physiology; D009949:Orientation; D012160:Retina / Q000502:physiology; D012858:Size Perception; D014794:Visual Fields; D014795:Visual Pathways / Q000502:physiology*; D014796:Visual Perception