my cat Zip (aka Zippy) loves to play with string...anykind, it doesn't matter...she is almost 12 , and she still is crazy as ever..and being the talker that she is, will use a very short meow to let me know that she is ready to play "string"...also, my other cat, Shy, loves to play with the plastic rings off of milk containers...she just bats the thing around, and around, and around,..lol, she will pick it up in her mouth and take it to another room, and then set it down and begin playin' again...