Monarch Caterpillars

We are careful not to disturb the milkweed plants that line the lower part of our driveway, hoping to attract Monarch butterflies.  But since the only butterflies I ever see there are Swallowtails, I assumed that the many caterpillars we found on the plants today were Swallowtails.  I am so surprised to discover that they are actually Monarchs.  So obviously we had visits from Monarch butterflies when I wasn't looking.  Yippee.