Nico is pretty hopeless when it comes to letting him run in a non-rat-proof room. He gets so excited that he's out, he doesn't even listen to me. When he's in his cage and I call for him, he comes, but out of it? Pffft. My room is filled with stuff he could hide behind and under, so on the bed he stays. Once he gets this "I'm gunna jump!" look, playtime's over. lol