The plant and tree shrew have a symbiotic relationship. The gyroid mitochondrial membranes in tree shrew cones might have an optical function. It is most closely related to the tree shrew and canine AdVs. Another - tree shrew polyomavirus 1 - has been described in the tree shrew. The Indian giant squirrel and tree shrew are other interesting species. The Crested Hawk-eagle ("Nisaetus cirrhatus") has been known to prey on this tree shrew.