Giant Deer

Giant Deer are animalistic Monsters in the Facility. They are not listed on the Whiteboard, nor are they seen during the System Purge.

Physical Descriptions and Attributes
The Giant Deer, as their name implies, are normal looking deer, but of abnormal size, being much larger than those encountered in nature. By observing them inside their Cube Prison, it appears both deer are bucks; proven by the large antlers on their heads, which is presumably how they attack and kill their prey.

Since the Giant Deer have no outwardly or supernatural features, the reason for them being kept inside the Facility is unknown, but its likely they are there for being somehow hostile to humans. Another possibility is that they suffer from some sort of virus like rabies that causes them to act out aggressively, specifically towards humans.

It is unknown what object summons them from the Cabin's Cellar, but fiddling with a pair of deer antlers or an unusually large deer skull could.

Appearances
The Giant Deer are not seen during the Purge. They are only seen very faintly in their Cube Prison in the early adaptation of the film's elevator scene, directly to the left of the Giant, prancing around their cell.