I live in Austin, we used to have huge butterfly migrations long ago, they were amazing to see, big swarms of Queen butterflies as well as Monarchs and other species. Last year's was heartbreaking to see, handfuls where there once were swarms, though I think that was driven by the drought. I have a pollinator garden and have been tracking butterflies in iNaturalist for a decade, last few years the numbers have been showing real decline. I think it's mostly habitat loss for my area.