I envisage curly poos
Mine all love them but I have to be careful because Mellika tries to eat them if I dont watch her !!!
http://www.purrsinourhearts.co.uk/catalog/curly-purrlies-in-pack-p-91.htmlThese! Look really simple but the cats are going absolutely mad for them. I bought them as a stocking filler for Asteroid, thankfully she shares!