Look Inside the 'Alien Deer': Visual Evidence of How Muntjac Facial Glands Function
By Alexander Ross
The most widely circulated videos show domestic or rescue muntjacs opening their glands while being petted or hand-fed apples and bread. This behavior sparks widespread confusion. Online commenters regularly ask whether the deer is terrified, suffocating, or experiencing an allergic reaction.
In reality, facial gland flaring correlates directly with sensory excitation and physiological arousal. When an animal encounters high-value food or novel stimuli, its parasympathetic and sympathetic nervous systems fire simultaneously. The act of sniffing novel food items prompts deep inhalations, shifting the surrounding facial musculature.
Gland flaring also serves as an affiliative greeting ritual. Hand-raised muntjacs frequently flare their suborbital pockets while licking the skin of human caretakers, simultaneously inhaling the human's individual scent and offering their own chemical greeting. What appears horrifying to human observers is, from the deer's perspective, roughly equivalent to a dog wagging its tail while sniffing an outstretched hand.
Alexander Ross has covered the video game industry for a decade, writing deep dives on game design, esports tournaments, VR developments, and gaming culture.
