Biological traits have been interpreted as natural kinds in the philosophical literature. Here, we argue that current theories cannot properly explain how traits evolve, and, following the evo-devo approach to evolution, we propose to characterize them as natural dispositional kinds instead. We further argue that this particular case study constitutes an example of a kind of interaction between metaphysics and biology that we label Metaphysics from Biology, where the specific demands of a complex reality such as evolution require the development of metaphysical notions that seem to go beyond those given in the literature.