Somebody has been eating my lettuce

I went out on the balcony to pick some lettuce to top a veggie burger. It's the kind of thing I do often. But this time I had a bit of a shock. Where had all my lettuce gone? It was there yesterday. And why is there a green leaf underneath the red... oh wait.

The Big Guy

This is what happened to my lettuce, and the leaves on my kholrabi. This tiny little caterpillar, bright green and jewel like. So cute you could cuddle it. If you weren't a gardener and it wasn't eating your crops. I guess I'm just a soppy fool though, I moved the little things where they can't harm my edibles. Am I far too soft?

And his brother