Abstract
AbstractInfant‐carrying in a family group of siamangs with twin offspring was observed during a 2‐week period. The twins were about 11 months old at the time of the study. One or both twins were usually carried by their father, but hardly ever by their mother. A considerable amount of infant‐carrying was also contributed by the twins' juvenile brother. Helping behavior (defined as the care of offspring by individuals who are not their parents) is not normally known to occur in siamangs or other hylobatids. We suggest that the presence of multiple offspring may have facilitated the occurrence of infant‐carrying exhibited by a nonparental family member. This finding may point to one of the mechanisms influencing the occurrence of helping behavior in general.
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