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Infant Response to Mother Call Patterns in Otolemur garnettii

Garnett’s greater bushbaby infants vocalize in apparent response to their mother’s contact calls. However, it remains unclear whether specific vocal or behavioral patterns by a mother elicit this vocal response. We video-recorded the behaviors and vocalizations of 4 individual mother-infant groups (mother with twins), analyzed vocalizations via spectrography and documented behaviors of mothers and infants. Initial analyses of all groups revealed that short growls and short growl bouts (or chains), but not long growls, emitted by mothers, were followed by infant clicks within 5 s. Further statistical examination of 1 mother-infant group revealed that an infant’s vocal response is conditional on the sequencing of the mother’s short growls and somewhat conditional on the mother’s behavior before or after the short growls.