The likely meaning is "let me out!" Given his freedom so far, not sure sure it is best to keep him in the cage, but rather reduce the time to shorter periods. If you could reset the clock, a period of observation from the cage might be best, but you've done no permanent damage!

Peanut has had two major changes; new home and freedom from the cage. You now have control over the latter and can ease the transition with progressively longer periods outside the cage.

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