The unique kidney of the spider monkey (Ateles geoffroyi).

Among nonhuman primates, the renal anatomy of the spider monkey (Ateles geoffroyi) is unique, as it is multipyramidal and multipapillary. Renal function parameters (glomerular filtration rate, renal plasma flow, and concentrating ability) are compared to man and other primates. The kidneys of the spider monkey are similar both anatomically and functionally to man.