Caterpillar on my parsley

Question

These are all over my parsley. Do I leave them alone or kill them? Here is a picture.

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Answer 1

Are they eating your Parsley?

The largest Caterpillar looks like a Monarch or SwallowTail. I love them in my garden and try to leave those alone.

Here is a link with some information.

https://www.gardeningknowhow.com/plant-problems/pests/insects/prevent-caterpillars.htm
https://www.gardeningknowhow.com/edible/herbs/hgen/herb-growing-problems.htm