Posted by: Marie Manguette, Mbeli Bai Gorilla Study , a Woodland Park Zoo Partner for Wildlife At Mbeli, we follow twenty-one groups of gorillas that come to feed in the clearing. The number of individuals in a group ranges from just two to around 13. In gorillas, it is generally only the mother that takes care of her infant, with no assistance from the other members of the group. Mom Dinka carrying her male infant Duma on her back. Photo by Marie Manguette On rare occasions however, we have observed juveniles carrying their siblings on their back or helping them when they are climbing trees. These altruistic behaviors have been observed in only two of the groups followed at Mbeli, and in both female and male juveniles. While rare in the wild, this phenomenon seems quite common in habituated or captive groups of gorillas. Zulu’s group is one of these groups where juveniles have been observed caring for and supervising their siblings without interruption from the