my caterpillar is trying to escape?

Hi, I found a caterpillar in the iceberg lettuce last week and feeding it since then. It was ok with lettuce and parsley and I put it on a plant which its not eating, however for 2 days its trying to run away. I thought it may be trying to find a stick to cacoon thus i put it on the plant (with food of course) it ended up on the floor again. I put it in a box with lettuce parsley and wetted towel however its constantly walking. I cant let it out since its winter here. Can it be bored of lettuce?

Elena2014-12-30T09:43:13Z

You need the top of plastic make small holes can caterpillar breath