I have a stalker, and the stalker is Pearl. Pearl, it bears saying, is one of the two cats that live in my house. When I close a door, she often feels left out. This gives her plenty cause to hammer away at the door until she feels important. I use the word hammer because she truly attacks the door. The thuds are loud and sound very much as if she were a person knocking.
I'll post some pictures of the turtles as soon as the sun comes back enough for me to get some good light. My place is of the darkness in the evening.