I apologize if this has been asked and answered before, but I honestly wouldn't know what search strnig to use to find it.
Are there other types of butterflies or moths that eat milkweed leaves in their larval stage? I found two tiny cats on leaves I brought inside with eggs on them, and these two cats don't really look like Monarchs to me. They do have whitish bodies but they also seem to have reddish heads. I'm keeping them separately until they get big enough to identify. Is there another butterfly/moth that eats milkweed?