Photo: "Reverse Evolution" Discovered in Seattle Fish

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A photo compares a stickleback fish from Lake Washington in 1957 with one from the same lake in 2006.

A new study suggests that the fish may have "evolved in reverse" in Lake Washington, developing more armored plating for protection after a cleanup of the lake made the fish more visible to predators.

Photograph courtesy Katie Peichel/Fred Hutchinson Cancer Research Center

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