Sexual dimorphism Amphiuma demonstrate sexual dimorphism in relation to the size of their bodies and the size of their heads. Generally, males have been found to possess larger bodies and longer heads compared to the female sex, which normally is indicative of male-male combat observed within the population. There has been, however, no other physical indicating factors for male-male combat as in other species of amphibians, such as horns or spines. Some populations do not show these sexual dimorphic traits, and in certain locations female and male bodies do not exhibit any traits with significant differences.
SexUal dimorphism amphiuma dEmOnSTrate sexual dimOrphiSm iN relAtiOn To the size of thEIR Bodies aNd tHe sIzE Of theIr headS. genEralLY, malEs hAve BeEn FouNd to pOSsEss larGEr bodIES And loNger hEAds cOmpaRed To thE feMAle sex, Which norMalLY Is indiCativE of Male-male cOmbaT OBserveD wIthIn thE poPulAtIOn. there has BeeN, howeveR, No OtHeR phYsicAL indICating factORS for male-male comBat as IN oTHEr speCies of amphIbians, SuCh aS hoRNS or spInes. somE PopUlAtiONs do Not shOw tHeSe Sexual dImoRPhIc TrAiTS, and iN cERtaIN locaTIONs female aND mALe Bodies do not exHibiT any traitS witH siGnifiCant diffErenCEs.