Well, my Dante and my Nala are both accomplished jumpers, and Dante and extremely accomplished climber. Toby and Templeton couldn't be bothered, I think they like the idea of their natural territory (the floor). Never mind that Templeton is about 3 1/2 pounds (he's lost about a pound and a half since I rescued him last year and Yes, he's named for the fat rat in Charlotte's Web-thanks Cheryl! LOL) and can't hoist his fat butt up onto the couch quite yet, but he's close. I imagine he could be a jumper/flyer like Dante is. Here's a cute story for you. When Dante was a kit, up till he was about 9 or 10 months old, he had NO concept of what an edge was. You know, edge of the couch, edge of the chair, edge of the coffee table. He just could not concieve the notion that things ended. He'd climb on the couch no problem, be running along and playing on it and the cushions, and keep on walking not realizing that the end of the couch had come, and THUMP, onto the floor he'd go. But, he'd get right back up and do it again. It was funny as hell! He learned finally after a couple of months of doing that. But, I suppose (Dante was my only pet store purchase, all of my other guys have been rescues or adopted) that when you live your life in one of those teeny round plexiglass containters you wouldn't have to worry about an edge. And, his concept of edges wasn't just the couch... it was all the furniture and sometimes his cage. I have had more friends comment to me that ferret proofing is worse than child proofing! LOL Sue and the fab four Dante, Toby, Templeton and Nala [Posted in FML issue 3977]