This shortsightedness may be the result of evolving as a forest dweller. Recent studies suggest that, in spite of its horns and large nose, rhinos do have binocular vision. The horn is not a true horn. It has no bony central core. It consists of aggregated hollow keratin fibers.
Keratin is a substance similar to hair and fingernails but it lacks the outside cuticle.
Rhinos use their horns for defense, as well as to dig, and to pull up small trees or push limbs. Rhinos are pachyderms, and do not sweat. A coating of mud offers a means of cooling the body. Mud can take over an hour to dry and absorbs body heat in the process. A thick coating of mud also offers protection from flies, ticks, and lice.