Check out my first mask, a realistic 3D horse mask: https://www.snapchat.com/unlock/?type=SNAPCODE&uuid=53ba178a7d004d31abe0e3344beacb52&metadata=01
Mouth, Eyes and ears are using face expressions to be moved. E.g. looking angry will lower the eye brows and tilt the ears back. Laughing, opening/closing mouth, raising/lowering eyebrows, blinking and eye movement is supported.
PS: also notice the eye lashes and muzzle hair ;)