Your pictures are gorgeous, Grace! I believe the second picture is a cabbage white.
Tell me more about your zebra swallowtail!
I've only seen one locally, and that was about two years ago, near a nearby creek. Small flowered pawpaw, asimina parviflora, grows along most of the creeks here, so there is enough host plant material to support more zebra swallowtails than I've seen here. I've planted several asimina trilobas, the bigger leafed and bigger flowered type that they really prefer, so that in case one comes by here and has some eggs that need laying, I'll be ready. A butterflyer friend in another state sent me 4 ZS chrysalids, and two of them emerged last year. The other two have overwintered - I've LOVE to start my own colony of them!
Do pawpaws grow in your area? Do you see ZSs often?
If so, I'm jealous!
ZSs are a type of butterfly, along with red admirals, that I haven't raised and see only rarely - I'd like that to change!
Thanks for sharing your beautiful pictures!