Why do leopard frogs come in two colors?

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

Elm leaf beetles are just one of the introduced species that

Northern leopard frog have fewer places to sing, meet and breed tadpoles from a 6,000-egg jelly - Cambridge Day

Northern Leopard Frog

Northern Leopard Frog

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

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

Northern Leopard Frog- Lithobates pipiens

Northern Leopard Frog The Canadian Encyclopedia

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

Northern Leopard Frog, Rana pipiens pipiens

Northern Leopard Frog

WCLT - Nature Notes 8/13/2010 - Frogs at our feet