Frederick went for a hike, and on the way found a monarch caterpillar on a milkweed. Very carefully, he brought home the entire plant to show me.
To be sure the caterpillar stayed safe from the hungry hens, we moved it to the world's tallest milkweed (maybe -- it is over six feet tall, almost seven feet in fact, and hanging out with the asparagus ferns). Frederick came next day to make sure it was doing just fine. Glad to report, the answer is absolutely.
Thanks for taking care of this little miracle for us, Frederick!