Exploratorium
Exploratorium: Frogs, a Disappearing Act
At this site students can read about how frogs camouflage to avoid predators. There is an interactive exhibit too! (Must have the Shockwave plug-in to see animation.)
BBC
Bbc: Nature: Wildlife: Common Frog
Use this site to learn all about the life of a frog. Read this detailed fact sheet and examine these photos for further information.