title: Biometric analysis of incipient speciation in the ringed snake. Natrix natrix (L.).
mesh_terms: D000818:Animals; D005075:Biological Evolution; D001699:Biometry; D004463:Ecology; D005060:Europe; D005260:Female; D014644:Genetic Variation; D005828:Genetics, Population; D008297:Male; D012911:Snakes / Q000145:classification / Q000502:physiology*