Black howler monkey - These South American monkeys are the loudest terrestrial animal in the Western Hemisphere, and are usually the largest and most abundant primate wherever they live. Blond at birth, males turn black as they mature, while females stay blonde their entire lives. Smithsonian Zoo. Washington DC, USA.
also known as owl monkey .live in Central and South America in dense tropical rainforests, located on the high altitudes.measure 12 to inches long and weigh 32 to 34 ounces.have unusually colored faces.