I found this one building his web on an azalea. The body was about 3/8" long from head to tail.



Milkweed bugs have few predators because they concentrate in their bodies bad tasting compounds found in the sap of milkweed plants. The bugs use "apostematic coloration" to advertise their bad taste.
With their acute sensitivity to pesticides and toxins, their presence, diversity and relative abundance indicate the overall well-being of our ecosystems.