What kind of insects are those buffalo?

Kathryn Cramer: What Kind of Insects Are Those Buffalo?
Via Kathryn Cramer, we learn of a webpage which, in discussing perception, talks about an African Tribe whose sense of depth and size perception is skewed by growing up in dense jungle.
This perceptive problem really works, I am told, on, say, drives on the Great Plains, where the flatness of the ground makes it difficult to judge sizes and distances to objects, since there are few frames of reference.