The persistence of two colors everywhere suggests a balance of evolutionary forces
Northern Leopard Frog (Rana pipiens) - Amphibians and Reptiles of South Dakota
Tiger whiptail lizards come in many forms
Northern Leopard Frog
Northern Leopard Frog - Lithobates pipiens
Nature Notes: Grounded - Leopard Frogs at Kankakee Sands
Leopard frog, Habitat, Diet & Calls
Northern Leopard Frog Facts for Kids - NatureMapping
Southern Leopard Frog - Christopher M. Schalk
Northern Leopard Frog - Lithobates pipiens
Why do leopard frogs come in two colors?