@evalieutionspics In response to your question . . . the plant they are on is Antelope Horns Milkweed . . . here is a link to a photo I posted in my 'Extras' album with some information about the plant. I noticed the dozens of tiny butterflies on the plant and was curious to find out more about it: https://365project.org/gaylewood/extras/2017-04-01