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Though not as toxic as some other species, the green and black poison dart frog holds enough poison to make a human quite ill. These beautiful little frogs range in shades of green from a dark forest, to mint, lime, emerald, and turquoise, and can even be outside of the green spectrum with pale yellow or cobalt blue coloration. Native to Central America and northwestern parts of South America, these colorful frogs were also brought to Hawaii, where they have thrived.