You will see many different species of monkeys on International Expeditions’ Amazon River cruises, but few compare to the uakari. This endangered animal stands out from the crowd with distinct features including a red face, short tail and bald head. IUCN Redlist classifies all three subspecies of the uakari as vulnerable, just one step away from being endangered. When the animals become excited, their faces flush. This may be a tactic for attracting mates, as pale skin is often a sign a uakari monkey is sick.