I have to leave the quaker cage doors hooked with locks. From the inside, Frank cannot undo these locks, but apparently he can from the outside. When I went to lock them up with their dinner, I discovered the lock to their front door was missing. After searching, I found it, locked, on Ava and Linus's cage. To be more specific, it was locking their door shut. Mmmm, ok. They were not in it at the time, guess he wanted to keep it that way!
The oldest pic of Frank I can currently find on my computer!
I remember it as one of the first, not sure if it was the actual first, though.