Another Hamster question for you since you were so helpful about the food. Have you ever had hamsters that seemed to just go "nuts" to get out of their cages? I switched to 10 gallon aquariums for them because of safety concerns after one of the wire cages was knocked to the floor by a big dog. The hamster survived, by the way. But, both of them appear to be frantic when they are awake. I had a tube and tree house in both, but the one used the tube as leverage to chew her way out of the aquarium lid, so I had to take it out. She just strains to reach up to the top, standing on every plaything she has. Last night she actually was trying to jump on her water bottle which hangs down. They have good wheels that they run on and other things to play with, but I think they miss climbing. We occasionally let them run around in the hamster ball, but have to be careful about that because of two dogs and a cat in the house. Any suggestions for something I could do to make them happier? I don't want to invest in large plastic cages because one of them has just about chewed through the plastic on her tube and treehouse. I just want them to be happy!