Caterpillars, lots of them

They go through several stages, eating constantly and shedding as they get larger. I'm not sure what stage these are at or how many they go through.

This one just shedded.

I counted 12 on this dill plant.

If I've identified the caterpillars correctly, they will turn into Black Swallowtails like this one.

The caterpillars really like the dill and rosemary we planted this year.   I don't know where the larger ones go to turn into the chrysalises.  I put a couple in a jar and will watch to see if they will complete the metamorphosis.