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Tom Roth, a master of science student in Environmental Biology, Utrecht University, the Netherlands, came to the Department of Biology to broaden the knowledge of the Department students in the field of animal biosciences. In the guest lecture event held at Reading Room (Ruang Baca) of the Department of Biology (June 25, 2018), he explained the aggregation behavior of Sumatran orangutans (Pongo abelii) living in the low-productive forest.
He investigated the aggregation behavior of Sumatran orangutans living in Sikundur, Sumatra Utara. 
"The Sikundur orangutans aggregate is less often than earlier studied Sumatran orangutan populations and it is more similar to that of Bornean orangutans". he explained his research result.
"I think that the aggregation behavior is influenced by local fruit availability. In addition, it indicates that the aggregation of Sumatran orangutans is more heterogeneous than previously thought", he added.
He concludes that there may be large differences in aggregation behavior between orangutan populations on Sumatra.
The event is part of collaborative work of the Department of Biology initiated by Dr. Puji Rianti S.Si. M.Si. (Animal Biosystematics and Ecology Division).