Two years ago a brief article in Science raised the questions as to whether or not the advent of transgenic crops, in particular glyphosate resistant corn and soybeans, might mean the Monarch butterfly (Danaus plexippus L.) is in trouble (Anon. 1999). It is well known that the larvae of the Monarch butterfly feed exclusively on a few species of the milkweed family. In our part of the world, their food is essentially common milkweed (Asclepias syriaca L.). The article estimated that nearly half the monarchs in North America migrate to overwintering sites in Mexico through the Midwest region. They also assumed that much of the milkweed that monarch larvae depend on was found in crop land that would be treated with glyphosate and this could “… devastate monarch food supplies.”