The Sambar has a gland on the underside of the eye that swells when the animal is angry or excited. Sometimes it mixes its own urine with secretions from this gland and spreads it on the ground to mark its territory.
水鹿眼睛下生有「眼下腺」，生氣或興奮時會張開，有時還會混和自己的尿液和眼下腺體，在泥土上摩擦以標示領域。