In 1967, biologists Robert MacArthur and E.O. Wilson developed a new ecological theory: Island Biogeography. It wound up becoming crucial to the way we understand how animals adjust to living in a world that has been completely altered by humans.
Prasinohaema skinks, residents of New Guinea, have green bones, green muscles and green tongues. Even their blood is green. And it's also a deadly poison. But how their blood got so green, and so toxic, remains something of a mystery.