The Opposite of Escape

What is the opposite of an escape?? It would be breaking into another pen. I had left the sheep pen unlocked and Cracker Jack figured it out. He went into the sheep pen to see if there was food in there. Cracker Jack was a little rude since there was no food. He was kicking at the sheep. I got him out of there as soon as I saw what was going on. The sheep knew the gate was unlocked but did not even try to leave. I think they like having their own spot. Who knew they were so smart?? And Cracker Jack is a donkey, so I’m not surprised he acted as he did.