Watch this stunning footage of a White Rhino Bull doing his thing at one of his middens. Rhino Roadmaps: The Secret of the Midden One of the most fascinating — and lesser-known — behaviours of the White Rhinoceros is its use of dung middens. These aren’t just random piles of droppings; they’re complex, chemical “bulletin boards” used for communication, territory marking, and social order. What is a Midden? A midden is a communal dung pile where white rhinos repeatedly defecate in the same spot.