When Do Deer Polish Their Antlers?
Deer do not actually "polish" their antlers in the traditional sense.
What Happens
Antlers are made of bone covered in velvet. When fully grown, the velvet dries and rubs off. Deer rub their antlers on trees and bushes to remove the velvet and expose the hard bone underneath.
This rubbing and scraping may look like polishing but is part of the natural shedding process.