Caterpillar Hunting

A very hungry group of caterpillars have decided to dine on my new petunias.  I can't believe I am hunting for caterpillars in my spare time.  I found five in one plant!  I wasn't  sure what to do with them.  How do you dispose of The Very Hungry Caterpillar after all?  I decided the humane thing to do was to let them stay on their leaf.  Then take the leaf to the alley with other plant debris.  Problem solved.  Conscious clear.