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a black howler monkey with baby in the lowland rain forest of Panama A black howler monkey, from the neotropical rainforest of Panama, with an infant clinging tightly to her breast. Mothers and infants usually stay together for two and a half years, even after her offspring has reached sexual maturity at 18 months. Howler monkeys are among the largest of the new world monkeys, and they are the only species with variable fur color. Howler monkeys also happen to be the loudest of all land mammals on Earth, and the male's lion like roar can be heard from as far as 3 miles away.