Why do leopard frogs come in two colors?

The persistence of two colors everywhere suggests a balance of evolutionary forces

Northern Leopard Frog (Lithobates pipiens) - Minnesota Amphibian & Reptile Survey

Northern Leopard Frog Care Sheet - Reptiles Magazine

Southern Leopard Frog Missouri Department of Conservation

Lithobates palustris (Pickerel frog) - Michigan Natural Features Inventory

Northern Leopard Frog Facts

Tiger whiptail lizards come in many forms

Northern Leopard Frog Care Sheet - Reptiles Magazine

Natural Selections: Why do leopard frogs come in two colors?

Northern Leopard Frog

Wildlife Around Las Vegas, Northern Leopard Frog (Lithobates pipiens)

Northern Leopard Frog - Lithobates pipiens

Roy & Charlotte Lukes: Leaping Leopard Frogs - Door County Pulse