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This report on the intratroop social behavior of Alouatta seniculus , based on field work in Trinidad and Venezuela, emphasizes the importance of apparently matrifocal groupings. Comparisons are made with other species, particularly to A. villosa , and red howlers are found to do more allogrooming then the latter and differ in sexual and other behavior patterns. The interest of juvenile, subadult and adult females in recent infants is emphasized.
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Melvin Neville (1972) studied this question.
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