Caterpillars!

So I went out and looked at our plants that are growing and I noticed a little caterpillar. (I like caterpillars) I wanted to see it from a different angle and saw that there were TONS!!! It was so disgusting! They were eating all of our sunflower leaves. Three days later they had eaten an entire sunflower plant (the leaves) and moved on to another one! I now do not like caterpillars as much.