Here, 11. 1987 15 December and inguinal region. The latter appeared more (continued) pinkish and slightly swollen, causing me to wonder if the animal is a ?. It then made several complete circles on the limb, pressing its chin and chest lower than the hindquarters - scratching, marking, both, or what? From time to time it purred upstream w/ head and foreparts raised, at which time the distinctly lighter throat (and chest?) was very evident (social signal?). It eventually stretched out against another horizontal limb, facing into the sun and apparently basking. Before settling down it once abruptly moved to a limb that forked upward basal to the main limb, turned and in some manner lifting the tail - defecating, urinating, mating, or what? The other remained visible for approx 10 minutes, then abruptly disappeared into the water. Carmen and I started to walk S. off the bridge and saw an adult male Bradypus variegatus climbing the bare trunk of the Cecropia at approx 2x normal (i.e., compared to previous observations) speed. At first I thought the first sloth was ascending again after an unsuccessful down, but now saw it at the top of the tree, suspended under a leaf. The second sloth ascended the tree continuously, and quickly reached the first animal without deviating on any side branches. As it arrived it reached for the other w/