In this episode, Emily O’Sullivan (Haverford ’19) teaches us about fish that can rapidly change their sex in response to changes in their social environment. As part of this, she tells us about a study in Blueheaded Wrasses, a species of fish in which females can change into males, and some males pretend to be females in order to sneak into breeding opportunities (Todd et al., 2017, Molecular Biology and Evolution). Do the brains of these “sneaker males” look more like male brains or female brains? Tune in to find out!