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Old World nonhuman primates commonly found in research institutions are distinguished by the following characteristics: Social disposition: Like human primates, nonhuman primates have an inherent need ...

In the United States, such colonies have been established in all eight Regional Primate Research Centers. Under undisturbed conditions Old World monkey infants are weaned by their mothers at the age ...

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but these primates (mostly Old World monkeys) have greatly reduced joint mobility throughout their limbs and they utilize more pronated hand positions. Terrestral quadrupedalism can be subdivided ...

The role of body-size variation as a "line of least evolutionary resistance" has been documented in both Old and New World monkeys (Figure 2). In these cases, diversification of cranial form ...

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.

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 ...