Hummingbird and Butterfly Gardening: Help ID Please, 1 by Loon

Loon wrote:
Found this butterfly on the driveway and rescued it from my chickens. Kept it in the house last night in a butterfly cage. I thought maybe it was still "changing". It became very active fluttering it's wings during the night. This morning I put it on this plate by the birdfeeder to take it's picture then put it on the lilac bush where it's been hanging all day.

Can you please tell me what it is?

Brenda