Barking deer, also known as muntjac, have prominent preorbital scent glands located just in front of each eye. These glands appear as narrow slit like openings in the facial skin and are far more developed and visible in muntjac than in most other deer species. The glands can be actively opened and closed by small facial muscles, allowing the animal to expose the gland surface when it wants to release scent. These preorbital glands produce oily secretions rich in pheromones that carry informatio