environmental

Mimic

Formerly known as Skinwalker and also documented as Shapeshifter, this creature disguises itself as a normal patient to be admitted into the hospital, usually showing no anomaly signs until it suddenly says 'I'm hungry…' and transforms — either right after admission, during treatment, or during recovery.

Mimic is one of the signature enemies of Animal Hospital (Anomaly): a creature that disguises itself as an ordinary patient to get admitted, then suddenly says 'I'm hungry…' and transforms — sometimes right after check-in, sometimes mid-treatment, sometimes during recovery.

Once it turns, it lets out a loud growl and charges the nearest player or patient, including anyone waiting in the lobby.

If it reaches a patient it triggers an emergency you have to resolve by freeing them; if it reaches you, it drains sanity fast until you mash E to escape.

Behavior

Formerly known as Skinwalker and also documented as Shapeshifter, this creature disguises itself as a normal patient to be admitted into the hospital, usually showing no anomaly signs until it suddenly says 'I'm hungry…' and transforms — either right after admission, during treatment, or during recovery.
The Fandom wiki now redirects both of those old names to this entry, and 'Shapeshifter' is also the term used elsewhere on the wiki for this creature's transformed, hostile form.
On transforming it lets out a loud growl and crawls or staggers toward the nearest player or patient (including patients in the waiting lobby) to attack.
Attacking a patient triggers an emergency requiring the player to free them; failing it is a recorded animal death.
Attacking a player drains sanity rapidly and requires pressing E repeatedly to escape.

How to Respond

Best countered with the Gun (two shots to kill) or Taser; it can also be fought by hand, faster with more players helping.
A guaranteed tell before it turns is the patient performing 'Kyphosis/Poor Posture' while idling.
A static photo alone (no other cursed features) does not guarantee a Mimic — letting that patient in will instead start a Death Ritual during recovery, so close the shutters on that form of anomaly instead.

Quick tips

Watch for the 'Kyphosis/Poor Posture' idle animation — it's the guaranteed tell that a patient is about to turn into a Mimic.
Two shots from the Gun, or a hit from the Taser, are the most reliable ways to put it down; fighting by hand works too and goes faster with more players helping.
A static/glitchy check-in photo alone does not confirm a Mimic — that combination (static photo, no other cursed features) instead points to a Death Ritual during recovery, so close the shutters on that patient instead of admitting them.
If a patient attacks you directly, tap E repeatedly to break free and stop the rapid sanity drain.

FAQ

How do I know a patient is about to become a Mimic?

The confirmed tell is the 'Kyphosis/Poor Posture' idle animation while the patient is waiting — it shows up before the transformation.

What's the fastest way to kill a Mimic?

The Gun (two shots) or the Taser are the documented fast options; hand-to-hand also works and is quicker with multiple players.

Does a static check-in photo always mean Mimic?

No — a static photo with no other cursed features is instead linked to a Death Ritual patient, not a Mimic, so treat that combination differently.

environmental

Bed Monster

A black shadowy figure with two glowing red eyes that has a chance to spawn under a patient's bed, exuding black particles and breathing heavily while staring at whoever moves nearby.