I have easily 50 of these munching away on my Dutchman's Pipe Pipevine that grows over my chicken coop. Chickens won't eat them, fortunately. The eggs are maybe 1/16th inch, round and yellow, laid in clumps. The caterpillars grow FAST! The big one there is maybe 1.25" long, almost done growing. They do have a smelly osmeterium that they stick out from the top of their head if I poke them.
My backyard, all on my Dutchman's Pipe pipevines.
Just goes to show that "If you plant it, they will come!" I've NEVER had this many butterflies in my yard before. You will see at least two Pipevine Swallowtails in my yard at any given time. So awesome!