Green and Black Poison Dart Frog, La Selva, Costa RicaI’ve only spotted a few of these green and black poison dart frogs in my Central American travels — this one in Costa Rica. They are considered on the lower end of toxicity but still have enough poison to stop the beating of a human heart. That said, they need to really feel threatened to release any toxins. Interesting fact: they lose their toxicity in captivity leading scientists to believe they get their poison from a diet of mites and other insects in the wild. Nikon D200 with Nikkor 70-200mm lens (at 200mm — with Canon 500D close up filter) ISO 100, f/8 at 1.5 seconds.