Mouth
Fangs and other mutations that affect the teeth or jaws.
The frontal part of the face is hardened into a beak, which can follow horn colour rules or be colored as if they were fur.

Teeth larger than normal originating from the top jaws that poke out and may pass the chin.
On a species with a beak or hardened maw, their face is now softened and covered in the same fur or skin texture as the rest of the face.
Creatures with this mutation have numerous teeth that may stick out from their jaws more visibly than normal for their species.