Interestingly, we've read that as the other native milkweeds become scarce from habitat loss, Monarchs are relying more and more on common milkweed, Asclepias syriaca, which has a much lower concentration of toxins. Apparently Monarchs are much more edible these days than they used to be and predators are discovering that fact with predation of butterflies increasing (unfortunately just as we are also increasing the amount of bt in the environment!) Although from what we've seen stingbugs eat, we're guessing they don't have a clue what bad taste means! Great image, Chris.