Scientists Just Figured Out the Simple Reason Some Snails Change SexEsther Inglis-Arkell12/23/15 3:25pm305EditPromoteDismissUndismissHideGo to permalinkA surprisingly large number of animals change sex over the course of their lives. But why? Is it chemical? Is it due to some sophisticated twist of genetics? In the case of limpets, it’s way simpler than that.