Figure 1
From: Frequency-dependent selection by wild birds promotes polymorphism in model salamanders
Examples of polymorphic plethodontid salamanders. Each pair of individuals was captured in the same place at the same time. a, Southern Red-backed Salamanders, Plethodon serratus, Great Smoky Mountains National Park (Tennessee, USA). b, Southern Zigzag Salamanders, P. ventralis, Knoxville (Tennessee, USA). c, California Slender Salamanders, Batrachoseps attenuatus, Napa County (California, USA).