I’ve been watching these caterpillars grow the past few days, and I believe I’ve identified them! It appears that they might be orange-tipped oakworm moths.
I have to admit, I’m kind of bummed that they are not butterflies. Ah well. It’s neat watching them grow, shed, change colors, and eat all the leaves. If it’s quiet enough, I can even hear them chewing. It’s actually quite interesting.