Mulg gets. Had my boxes stacked on top of each other, and the cat knocked one over (very short distance, could barely be called a fall since they were on the floor). Checking to see if anything was broken, I found the only damage to be the pluck foam that Mulg had shoulder slammed open into the empty space next to him, doubling his living quarters. I have a feeling he's going to be rampaging through the complex, eating the smaller models soon...