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These vocal primates are the biggest of all the New World monkeys. Unlike Old World monkeys, howlers and other New World species have wide, side-opening nostrils and no pads on their rumps.
Nov. 8, 2019 — In terms of their body plan, Old World monkeys -- a group that includes primates like baboons and macaques -- are generally considered more similar to ancestral species than apes are.
Photo by Mark Beech The discovery, announced in the current issue of Proceedings of the National Academy of Sciences, USA, is providing important clues as to when and how old world monkeys ...