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Green-blooded Lizards Pose Evolutionary Puzzle

For some lizards it's easy being green. It's in their blood. Six species of lizards in New Guinea bleed lime green thanks to evolution gone weird. It's unusual, but there are critters that bleed different colors of the rainbow besides red. The New Guinea lizards' blood — along with their tongues, muscles and bones — appear green because of incredibly large doses of a green bile pigment. The bile levels are higher than other animals, including people, could...

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