Do you like pictures of butterflies? I sure hope so, because on Wednesday we visited Vienna's Schmetterling Haus and I spent some time collecting photos of the (alleged) 400 species of butterflies they boast.
The star of the show was the blue morpho, because they're big, bright, blue, and flying around by the dozens. The blue morpho is blue on the inside and brown with a large eye on the outside. They don't seem to land much, which made it very hard to get a good shot of them.
The top photo is a pair of blue morphos, showing their blue insides brilliantly backlighted by the glass of the greenhouse. The bottom photo shows another pair, one with wings spread and one with wings up so you can see both sides.
The Blue Morpho,
http://vignette3.wikia.nocookie.net/venturebrothers/images/e/ec/Blue_Morpho.JPG/revision/latest?cb=20160222234135
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You can see that the open one in the bottom photo is a different species from the one in the top photo, maybe the Achilles morpho.
Beautiful, Kevin.
The color isn't pigment. It is a wave interference effect as the wings have the structure of a thin film. The thickness is tuned so that constructive interference from reflected light is only in the blue part of the spectrum. Everything else passes through, which accounts for the brown appearance from underneath.
Most creatures have evolved subject to physical constraints. Not that many have evolved to exploit physics, which is why I love blue morphos.
There are a few places in the DC area with butterfly "gardens," but 400 species?! more photos, please.