For millions of years, a vibrant mix of colors persisted within a single lizard species. Now, much of that diversity has vanished in a remarkably short time. Researchers point to an unexpected cause: a bold green, highly aggressive, and dominant wall lizard that has rapidly eliminated several color forms within its own species. In many animal species, distinct color types, known as color morphs, are more than just visual differences. These variations often reflect different approaches to survival, such as how individuals compete for territory or attract mates. Each color can represent a unique strategy that helps maintain balance within a population. A Longstanding Balance in Wall Lizards The common wall lizard ( Podarcis muralis ), found widely across the Mediterranean, has long been a classic example of this balance. Individuals typically display one of three throat colors: white, yellow, or orange.…