Termites - crawling around in their mud nests that they call home. All around the country you see these big brown balls in the tree branches, and cutting or breaking them open reveals the little orange or white ant-like creatures. I don't know how or why they make these nests of mud in the trees, but I do know that when I stepped on this branch in Corcovado (bottom), it crumbled under my feet because of the thousands of termites hard at work.