Too nice a morning here to spend indoors blogging, so I'm heading out for lawn chores. In the meantime, enjoy this photo of Blue Morphos.
Many morpho butterflies are colored in metallic, shimmering shades of blues and greens. These colors are not a result of pigmentation, but are an example of iridescence through structural coloration. Specifically, the microscopic scales covering the morpho's wings reflect incident light repeatedly at successive layers, leading to interference effects that depend on both wavelength and angle of incidence/observance. Thus, the colors appear to vary with viewing angle, but they are actually surprisingly uniform, perhaps due to the tetrahedral (diamond-like) structural arrangement of the scales or diffraction from overlying cell layers...Addendum: As noted by reader Bill in the comments, this photo is likely staged. Blue morphos, like Mourning Cloaks and other woods/forests butterflies, have colorful topsides to their wings, but have camouflage patterns on the underside, so when resting they would sit with wings folded up. They would flatten the wings to solarize/absorb heat - but in this image only the topmost of the group are in the sun. This image was either generated with an image processor, or perhaps is a picture of a diorama in a tropical visitor's center or natural history museum.