Mathematics / Polymorphism / Social status / Territoriality / Biological Sciences / Cortisol / Testosterone / Aggression / Animals / Male / Social Environment / Cichlids / Arousal / Skin Pigmentation / Lake Tanganyika / Social System / State dependence / Cortisol / Testosterone / Aggression / Animals / Male / Social Environment / Cichlids / Arousal / Skin Pigmentation / Lake Tanganyika / Social System / State dependence
