Man learned thousands of years ago here in the Amazon that palm thatching protects them against the hot sun and the downpours of rain.
Wasps learned that same thing millions of years ago! So it's no surprise when I find wasp nests under palm leaves, as was the case of this one in the attached image. I assure you that they are well protected by this huge carnauba (Copernicia prunifera) palm leaf. The danger for us is that most of the time the nests are well hidden and it's easy to get too close to dwellers.