This is a small scale stunt double for the Lovecraft creature Brown Jenkin. It is a rat with a human-ish head, from Dreams in the Witch House. It is only to be used for a wide shot where it runs down the corridor. All closeups will be animated by Richard Swensson using his beautiful Brown Jenkin puppet. It can be seen in action at Richard's Bluworm channel at Youtube,in "Concerning Brown Jenkin", and there is also a video showing how it was made.