It has been widely held for many generations that male animals are usually larger and more physically skilled than females. This idea, which is fundamental to how we perceive the natural world, is present in popular culture, documentaries, and textbooks alike. This common understanding, however, is called into question by a novel recent study that reveals an unexpected range in size dimorphism among mammalian species. We will examine the study's results and consider how they may affect our comprehension of sexual dimorphism and the processes involved in evolution in this blog post.