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Release date- 03092019 - The utterances of Old World monkeys, some of our primate cousins, may be more sophisticated than previously realized - but even so, they display constraints that reinforce the singularity of human language, according to a new study co-authored by an MIT linguist.
Old World monkeys are a diverse and widespread group, which includes African and Asian macaques, baboons, mangabeys, leaf monkeys and langurs.
The discoveries are controversial but suggest that by 25 million years ago, two major primate groups were distinct: one that today includes apes and humans and another that encompasses Old World monkeys such as baboons and macaques.
They cover primate origins, the evolution of prosimians, anthropoid origins and New World monkeys, the evolution of Old World monkeys and apes, Ramapithecus and human origins, early hominids, and diverse approaches in human evolution.
Humans, apes, most old world monkeys, ground squirrels, and many species of fish, birds, and insects have well-developed color vision.
Humans, apes, and Old World monkeys have trichromatic vision, which allows them to distinguish between blue, green, and red.
He then reasoned that humans diverged from the Catarhine stock comprising of humans, anthropoid apes, and Old World monkeys, all having nostrils opening downward and close together and a nonprehensile, often greatly reduced or vestigial tail.
There were 1,215 procedures on New World monkeys and 3,584 on Old World monkeys in the year.
However, ( a new study based on experiments involving macaques - a genus of Old World monkeys - argues that the problem stems not from the vocal tract, whose capability has been "drastically underestimated," but from a lack of adequate brain circuitry.
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 dispersed out of Africa and into Eurasia.
Most Old World monkeys and apes are social, and some species, like the mandrills, can live in groups with up to 800 members, said co-author Jessica Lynch Alfaro, an adjunct assistant professor in the UCLA Department of Anthropology and UCLA's Institute for Society and Genetics.