In connection with the rubbing down of the anterior horn, Grzimek (No room for wild animals, 1956) remarks that captive rhinos shed their horns about once every ten years and it takes approximately a year to become renewed.
In June 1958, I received two samples of material removed from the head of a captive Indian Rhino living in the Bombay Zoo. The first sample was from the normal horn, which, as is commonly the case in captive specimens, had been rubbed down by the animal almost to the general level of the muzzle. the second was taken from an irregular horny growth which had arisen between the base of the normal horn and the forehead, approximately midway.
In June 1958, I received two samples of material removed from the head of a captive Indian Rhino living in the Bombay Zoo. The first sample was from the normal horn, the second was taken from an irregular horny growth which had arisen between the base of the normal horn and the forehead, approximately midway. Sections prove the material from the abnormal site to be identical in structure with normal horn-laminated strands of keratin.
In June 1958, I received two samples of material removed from the head of a captive Indian Rhino living in the Bombay Zoo. The first sample was from the normal horn, the second was taken from an irregular horny growth which had arisen between the base of the normal horn and the forehead, approximately midway. Identical in structure.
