Of all our cats' toys, their favorite is a little blue plush turtle, about two inches long. I haven't seen the cats carrying this in their mouths, though B. has, but I've certainly seen that it gets around. I will see it lying on the floor upstairs. Two hours later I will see it downstairs. Two hours after that I will see it upstairs again. We only have the one.
On several occasions recently I've awoken from a nap to discover I was sharing my bed with a little blue turtle. When I went to do my laundry a couple days ago, what should be sitting on top of the dirty laundry but a little blue turtle. It's certainly a busy and active little beast.