The Cow Skull Giant appeared in 2012 movie called The Cabin in the Woods. The Cow Skull Giant is a humanoid Monster kept in the Facility. It was not listed on the whiteboard nor was it seen during the System Purge.
As its name implies, the Cow Skull Giant is a very large humanoid creature that has a cow skull for a head. In addition it is seen wearing a long black robe. Its arms are almost the same length of its body and its hands are bony, and both have three slender, and sharp-looking fingers. It bears a similar appearance to the Bullhead Phantom, but it is unknown if the two Monsters are related, since little to no lore exists for either of them.
The cow skull, similarly to the one it wears on its head, is presumably what summons it from the Cabin's cellar.