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Science has confirmed that suspicion—Pacific tree frog can change color. Since the 1850s, biologists have known that the Pacific tree frog has green and brown color morphs and that the numbers of green vs. brown frogs differ from place to place and from season to season. Green and brown frogs were assumed to be camouflaged in different habitats and at different times of the year. However, individual frogs were also reported to have changed color between multiple captures.
While two-thirds of the California frogs did not change color, in a separate study, all Pacific tree frogs from a Washington population could change color. The Washington frogs also changed color more quickly, in as little as one hour. Color change occurred faster from brown to green than from green to brown, although the frogs were ultimately better able to match brown than green backgrounds.
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