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The scales on butterfly wings are pigmented with melanins that can produce the colours black and brown. The white colour in the butterfly family Pieridae is a derivative of uric acid, an excretory product. [13] [40]: 84 Bright blues, greens, reds, and iridescence are usually created not by pigments but through the microstructure of the scales.
Zerene cesonia, the southern dogface, is a North and South American butterfly in the family Pieridae, subfamily Coliadinae (until recently the species was sometimes placed in the related genus Colias instead of Zerene).
For most adult butterflies, including the small tortoiseshell butterfly, nectar is one of the main sources of nutrients. In order to obtain the nectar, the butterfly must be able to recognize distinct floral aromas and colours. The small tortoiseshell butterfly is able to differentiate between various flowers through visual signals. [16]
Pieris rapae is a small- to medium-sized butterfly species of the whites-and-yellows family Pieridae.It is known in Europe as the small white, in North America as the cabbage white or cabbage butterfly, [note 1] on several continents as the small cabbage white, and in New Zealand as the white butterfly. [2]
Media related to Butterflies of North America at Wikimedia Commons "Butterflies of North America" (1868-1872) by W. H. Edwards from the American Entymological Society; second series (1884), third series (1897)
Butterflies is a series of paintings made by Vincent van Gogh in 1889 and 1890. Van Gogh made at least four paintings of butterflies and one of a moth.The metamorphosis of the caterpillar into a butterfly was symbolic to Van Gogh of men and women's capability for transformation.
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If one draws the data-flow diagram for this pair of operations, the (x 0, x 1) to (y 0, y 1) lines cross and resemble the wings of a butterfly, hence the name (see also the illustration at right). A decimation-in-time radix-2 FFT breaks a length-N DFT into two length-N/2 DFTs followed by a combining stage consisting of many butterfly operations.