Why do leopard frogs come in two colors?

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

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

Ohio's 15 species of frogs and toads at a glance

Northern Leopard Frog (Rana pipiens) - Amphibians and Reptiles of South Dakota

Tiger whiptail lizards come in many forms

Frog Factors - Water Shapes

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

Northern Leopard Frog - Montana Field Guide

Northern Leopard Frog Care Sheet - Reptiles Magazine

Northern Leopard Frog Facts

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