Caterpillars on a butterfly bush?
My wife bought a butterfly bush. I noticed several caterpillars on it. I have never seen caterpillars like these. Does the bush attract them? Curious.
It is unusual to have caterpillars on butterfly bush. Butterfly weed is a well-known host for monarch caterpillars. There is one invasive caterpillar on butterfly bushes, the Buddleia "budworm" caterpillar. So far that has been a problem only on the West coast. Look up images to make sure that isn't what is on your plant.