Development of freezing and immobility, predator defenses, in the Bobwhite quail (Colinus virginianus).
D000367:Age Factors; D000818:Animals; D001522:Behavior, Animal; D005239:Fear; D006799:Housing, Animal; D006990:Hypnosis; D007103:Immobilization; D008124:Locomotion; D011784:Quail; D014828:Vocalization, Animal