Morphological/ˌmɔːrfəˈlɑːdʒɪkl/ Definition 1 of 2Pro Tip 1/3Physical Traits Focuses on observable characters differentiating living entities. Morphological traits in butterflies aid their classification. Pro Tip 2/3Evolution Insight Helps understand evolutionary relationships of species by comparing structures. Studying the morphological traits shows how species evolve over time. Pro Tip 3/3Not Function Describes shape and structure without implying function or procedure. Scientists found morphological similarities in fossils, not how they functioned.