Caterpillar ID?

Does anyone know of a good website for identifying caterpillars? I hate to be crushing beneficials or even a potentially pretty butterfly... but, I do have a heavy hand. It moves, I decapitate.

I love this place for ID. BTW, I've got lots of Anise Swallowtail caterpillars in my herb garden chowing down on my dill. LOL

http://butterflywebsite.com/

Thanks for the link.
and I don't think i want to trade anything for those swallowtails babies- unless you want some moles...

I'll pass on the moles! ROFL!!!

I have to say that those Anise Swallowtail caterpillars sure have a voracious appetite! At the rate they're eating my dill, I won't be left a thing. I counted 9 caterpillars on just one dill plant the other day. But I wouldn't dream of hurting them! They are such pretty caterpillars and they'll be even prettier butterflies. :)

Terri