Prenatal motility and postnatal play: functional continuity?
D000818:Animals; D001522:Behavior, Animal; D002642:Chick Embryo; D009043:Motor Activity; D024510:Muscle Development; D009132:Muscles / Q000196:embryology; D009420:Nervous System / Q000196:embryology / Q000254:growth & development; D010988:Play and Playthings