Monkeys! One of my students, Romy (nicknamed Caspi -- pronounced with a glottal stop between the C and A) showed me where they were today, just steps from the upper campus. Hugh says they're called Capuchins because they look like the Capuchin monks, but Caspi called them Martin Monkeys. They were backlit and hidden way up in the leaves, but I managed a few shots -- now you can see why, when Spanish-speakers see something cute, they say "¡Que mono!" ("How monkey-esque!")