Neoteny is a biological phenomenon where an organism retains juvenile traits into adulthood. This can include physical characteristics, behaviors, or reproductive features that are typically associated with younger stages of development. Neoteny is observed in various species, including some amphibians like axolotls, which remain in their larval form throughout their lives. In humans, neoteny is evident in certain physical features, such as a flatter face and larger eyes compared to other primates. This retention of juvenile traits may influence social interactions and mate selection, as these features can be perceived as more attractive or nurturing.