“Retrospective Analysis of Food Solicitation Behavior in Two Semi-Wild Rehabilitated Sumatran Orangutans (Pongo Abelii) in Bukit Lawang, Indonesia”. Indonesian Journal of Primatology, vol. 4, no. 01, July 2026, pp. 6-11, https://doi.org/10.29244/primatology.4.01.%p.