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Mandrill
These are the largest monkeys and probably the most colourful. They have a stop-sign red nose with blue or white-coloured stripes around it. These colours are duplicated on the back with bright red genitals as well as light blue butts. This makes it easy for them to follow one another in the jungle, not to mention it’s a mating must-have as female mandrills prefer a flashy-looking guy.