`  == Can animals ``perceive`` depth? ==  I have deleted the following from the introduction:  :Although any animal capable of moving around its environment must be able to sense the distance of objects in that environment, the term perception is reserved for humans, who are, as far as is known, the only beings that can tell each other about their experiences of distances.Hacker, P. M. S. (2002). Is there anything it is like to be a bat? Philosophy, 77, 157-174.  While this has been written and published, the most cursory search of the scientific literature finds plenty of references to perception of depth by (say) chimpanzees (nearly 9000 Google hits for ; ``Depth perception in the rat [Rattus Norvegicus)``; ``DEPTH PERCEPTION OF THE SYRIAN HAMSTER``, etc. etc. And etc. So it's at best an opinion, not an uncontroversial statement of fact.  `