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Thank you! The author of the article included the key analogy and I had to use it; really explains it quite simply for people who don't have a scientific background (or who suck at cellular bio like I do!).

That's a good question. I have to imagine that being slimy they do leave a tiny amount of residue, but I can't imagine it's enough to be particularly harmful...so long as you're not like licking leaves or anything lol. Also, the really poisonous ones live in the tropics where rain storms occur almost daily, so such residue is likely washed away fairly quickly. This is my best hypothesis, I actually haven't heard anything on the subject of poisonous frog residue!