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The prehensile tailed skink from the highlands of New Papua New Guinea has green blood due to high concentrations of the green bile pigment biliverdin. The green bile pigment in the blood overwhelms the intense crimson color of red blood cells resulting in a striking lime-green coloration of the muscles, bones, and mucosal tissues. Courtesy of Christopher C. Austin/LSU hide caption

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Courtesy of Christopher C. Austin/LSU

Why Do Some Lizards Have Green Blood?

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Blood quantum was initially a system that the federal government placed onto tribes in an effort to limit their citizenship. Leigh Wells/Getty Images/Ikon Images hide caption

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Leigh Wells/Getty Images/Ikon Images

So What Exactly Is 'Blood Quantum'?

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