Transition to siblinghood in a wild chacma baboon population

In monotocous mammals (i.e. where females produce one offspring at a time), most juveniles will experience the birth of younger sibling in their life. Transition to siblinghood (TTS) has rarely been studied primates, although it reflects last step shift maternal investment from next and could thus represent critical moment for mother–offspring conflict competition. Here, we used behavioural data on juvenile primates that had recently experienced, or not, investigate changes mother–juvenile relationships during TTS wild population chacma baboons, Papio ursinus. We show (1) spatial associations remained stable; (2) mothers did not decrease probability initiating proximity affiliation with juvenile; (3) initiated more frequently towards mothers, showed signs anxiety, after sibling. Taken together, these findings suggest solicit mother often seek attention than without. Overall, extend into postweaning period, which subtle resources, such as attention, be stake competitive relationships.