From the article:
This is just the these folks way of "blessing" the baby gorillas. (Infant baptism is more of a ceremony welcoming the infant into the community, rather than the baptism of repentance of sins.) It is the way these people show how they consider the gorillas to be a part of their larger community, and that they are concerned for their welfare. Since no actual gorillas were disturbed during this ceremony, what's the problem?