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I believe that the poison dart frog will evolve to look more like a tadpole. Global Warming can and will cause flooding, and being able to swim efficiently would obviously be very helpful. They would keep the tail and the smaller legs of the tadpole but keep the head and poisonousness of a fully grown poison dart frog. Evolving like this would take a very long time. I think that this would be the best way for the species to survive and thrive in this new environment.