A cut in a creature's ear, may be from a past injury. Usually a triangular notch, but can also be a hole or a missing ear tip.
Most commonly seen in feral or outdoor cats, sometimes as a way of marking them as spayed, neutered, and/or vaccinated. It can also be seen in other animals as well, but may also be seen in characters with animal ears. Humanoid characters can also have them on their regular ears.
Pixiv
Twitter
Bluesky
Weibo
Lofter
Tumblr
