Many Morpho butterflies are colored in metallic, shimmering shades of blue and green on the upper wing surface. The underside of the wings resembles foliage, with mottled brown, greys, blacks and reds. The female Morpho butterfly is less vivid than the male. The males bright coloring is designed to intimidate any rivals that might fly into his territory. The males wings reflect the bright, iridescent color over an extremely wide angle, to maximize its visibility in the rainforest.