The Morphos are among the best-known tropical butterflies, and you’ll know one if you see it! The blue only shows when they fly; the underside of their wings is brown with several eyespots. Look for them around the fruit we’ve put in the conservatory. Morpho butterflies feed on the juices of fermenting fruit with which they may also be lured. The butterflies wobble in flight and are easy to catch. he entire life cycle of the Morpho butterfly, from egg to death, is approximately 137 days.