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Extra group copulations are rarely observed among the Alouatta genus, which lives in a fragmented area in Brazil. Here, we describe the second extra group copulation in A. caraya in literature, which was the first from Brazil. This happened in the southeast urban island forest, which measures 25 ha. In this forest there are two troops: one of them with thirteen howlers and the other with four. These howlers may be extinct in a few years since in the region there is only 3.89 % of native forests and high anthropic action due to agribusiness. We discuss the possible issues that led to the extra group copulation.
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Fermoseli et al. (2013) studied this question.
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