Today, I bought Skittles (my new bunny), his cage and his feed. Everything else (toys, litter box, water bottle, hay) was already bought. But when I asked about straw or willow mats for the interior of the cage, the attendant told me that it isn't needed and that most owners just use the wire cage bottoms as-in. Right now, I have a washcloth in there, and tomorrow I'll be getting a mat for the interior. But it's kind of sad to see Skittle's little toes slip between the metal bars and know that if I hadn't read up, the poor thing would have to live like that for the rest of his life.