Costa Rican Green and Black tend to be the boldest of the auratus from my experience. With any frog, the higher humidity and the more possible hiding spots the more you will see the frog. It seems like less hiding spots would lead the frog to be out in the open more, but actually having a ton of options to scurry away to allows the frog to be bolder as he/she knows he/she can find a spot to hide quickly should anything come around. Also, frogs in high traffic areas tend to be bolder. They just get use to you.
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