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There are three migratory subspecies in the United States and Canada, differing in size, bill length, back and rump colours, wing bar width and colour, and length of supercilium: [13] R. s. apache, breeding and wintering from southern Alaska and the southern Yukon to southwestern California and southern New Mexico. This subspecies is medium ...
Image Scientific name Common name Distribution Characteristics Northumberland, UK: M. f. flavissima (Blyth, 1834) Yellow wagtail: Breeding: England, east Wales, southeast Scotland; occasionally on adjacent European coasts. Winter: West Africa, mostly Senegal, Gambia. Yellow-green head with a brighter yellow supercilium. Females markedly paler ...
On most species which display a supercilium, it is paler than the adjacent feather tracts. [3] The colour, shape or other features of the supercilium can be useful in bird identification. For example, the supercilium of the dusky warbler, an Old World warbler species, can be used to distinguish it from the very similar Radde's warbler.
Original file (2,000 × 1,125 pixels, file size: 174 KB, MIME type: application/pdf) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
PDF version of the chart. The colors of the chart were described by McCamy et al. with colorimetric measurements using the CIE 1931 2° standard observer and Illuminant C, and also in terms of the Munsell color system. Using measured reflectance spectra, it is possible to derive CIELAB coordinates for Illuminants D 65 and D 50 and coordinates ...
The two can best be distinguished by comparing the supercilium. Hall's babbler has a narrow and very dark brown crown-stripe with a much broader, vivid white supercilium. [ 7 ] Secondly, Hall's babbler does not have a 'fading' eye-stripe towards the rear of the head, where there is more chestnut brown coloration. [ 8 ]
Lawsone (2-hydroxy-1,4-naphthoquinone), also known as hennotannic acid, is a red-orange dye present in the leaves of the henna plant (Lawsonia inermis), for which it is named, as well as in the common walnut (Juglans regia) [5] and water hyacinth (Pontederia crassipes). [6]
The eggs are approximately 2 cm (0.79 in) in length. They are white in colour, with a band of brown spots around the middle, closer towards the base of the egg. Birds use the same song year after year, with progressively small changes, with the result that the song sounds very different after 4–5 years.