Quote Originally Posted by skhill View Post
One of my cats does something similar-- she'll walk around the house carrying a sock, making weird noises, then present it to me. From what I've heard, it's hunting/prey behavior. Does your girl speak while she's carrying her sponge?
Yep; one of cats did this with her toy mice. She would vocalize somewhat oddly as she was bringing it to me and then lay it at my feet. This happened almost nightly. She would also leave them in my shoes. She only did it with two specific toys, one of which was included in her ashes, it was so central to life with her.

But I would add that most cats have some stance habits that can't really be explained. They're funny that way.