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The birth of a second child was not only an extraordinary experience for parents, but also for older siblings
The study was conducted
Verena Behringer, a scientist at the Endocrinology Laboratory at the German Primate Center and lead author of the study, said: "As the pups grow up, there are a variety of processes of social weaning or food changes that also stimulate stress responses
Verena Behringer analyzed in the laboratory the concentrations of three different substances in urine samples: cortisol, neopterin, and triiodothyronine (T3
"With the birth of siblings, baby bonobos suddenly experience an extreme state of stress," Verena Behringer explains the results
Recorded behavioral data also confirm this hypothesis
Verena Behringer concludes: "Our study shows for the first time that the birth of a sibling is a really stressful event