Giant Ferrets

Giant Ferrets are animal Monsters kept inside the Facility. They are not listed on the Whiteboard, nor are they seen during the System Purge.

Physical Description and Attributes
As their name implies, the Giant Ferrets are depicted as a pair of normal ferrets, but of an abnormal size. Their fur is a greyish white color, and have pink noses. Nothing about the Giant Ferrets is outwardly or supernatural, meaning they are most likely kept inside the Facility for their massive size, or may be suffering from some sort of virus that makes them aggressive to humans, such as rabies.

The item that summons them from the Cabin's Cellar is unknown, but some possibilities could be common ferret toys, or tampering with their cage.

Appearances
The Giant Ferrets are not seen during the Purge. They are only seen in the early adaptation of the film's elevator scene, where they can be seen in their Cube Prison, directly above the Giant Floating Head.

Trivia
After the second wave of Monsters in the Purge, when the Dragonbat flies through the Elevator Lobby's control room, forcing Dana and Marty to flee, loud, rodent-like squeaking can be heard, just before Marty shoots the Mutant in Hospital Gown. The squeaking could possibly come from the Giant Ferrets, meaning they were released during the Purge, but just not seen.

Inspiration
Its presumably inspired by the "Killer Animals" a popular trope of countless horror films along with other media.

Possibly a reference to the 1959 B movie, The Killer Shrews about an island covered with mutated, bloodthirsty shrews.

Possibly a wink to Ghostbusters II, where a fur coat became living under a contact with the slime.