Awesome. So after the fiasco of being sick and learning that Dottie figured out how to slide open her cage door and finding her under the Tv table with her rump hanging out, Caesar has learned how to open his door kind of. I hear a 'thunk' sound and i go over to see that Caesar has managed to pull one of the doors out of the side track about 1/8". And was looking at how to get his head in there to work it back enough to fit his body in to slide the door open lol. So it looks like i have to use a lock on his cage too haha. Good thing i ordered all the AP cages with locks installed.