We are visiting in Costa Rica, and we came upon a tree full of nests. My question is about the architecture of these nests. We understand that researchers believe they help keep the eggs and baby birds safe from predators, and they might also offer some protection from wind and weather.  Is the very long pendular design also serving a function for keeping the temperature in a good range (neither too hot nor to cold)?  The nest architecture, with well-woven interconnections, is amazing. I wonder if, like with bats, the birds can move higher or lower inside the nest to find the most favorable location at different times of day and in different weather conditions.