Dolphins.
D000818:Animals; D001522:Behavior, Animal / Q000502:physiology; D001835:Body Weight; D001921:Brain / Q000033:anatomy & histology; D004289:Dolphins / Q000033:anatomy & histology / Q000502:physiology*; D007360:Intelligence; D008124:Locomotion; D009929:Organ Size; D013045:Species Specificity