We have some tall plants growing in one of our flowerbeds that we weren't sure what they were. We figured they were sunflowers because we had a bird feeder in the flower bed for a while so we let them grow. There was a monarch butterfly stopping at it a few times and we couldn't figure out why. Once it started to flower, it all clicked. Last year my wife planted some milkweed but it never grew and we just forgot about it. Now it's growing, and so are the monarch caterpillars. I counted 7 total, 5 large ones, and 2 small ones. Hopefully I will have some chrysalises soon.
This little guy is only about 1/4" long.