The Menelaus Blue Morpho (Morpho menelaus) is an iridescent tropical butterfly of Central and South America. It has a wing span of 15 cm . The adult drinks juice from rotten fruit with its long proboscis, which is like a sucking tube. The adult males have brighter colours than the females. Morpho menelaus is a very large butterfly, with a wingspan of approximately 138 mm. The forewing is concave at the outer edge. The upperside of wings are metallic blue.