Pale crag martin to do so, it would cast doubts on their specific distinctness. There are several subspecies differing in plumage shade or size, although the differences are clinal, and races interbreed where their ranges meet. The pale crag martin of the nominate subspecies "P. o. obsoleta" is 12–13 cm (4.7–5.1 in) long with light brown upperparts, becoming paler on the lower back, and a short square tail that has small white patches near the tips of all but the central and outermost pairs of feathers. It has a pale grey throat, upper breast and underwing coverts, and the rest of the underparts
Powder blue X11 color names defines "powder blue" as a pale cyan shade, RGB(176,224,230), as shown here. This is the colour which is displayed by web browsers if "powder blue" is specified in HTML or CSS code. Powder blue Powder blue is a pale shade of blue. As with most colours, there is no absolute definition of its exact hue, but according to Etymology Online, "powder blue" originally referred in the 1650s to powdered smalt (cobalt glass) used in laundering and dyeing applications, and it then came to be used as a colour name from 1894. Although smalt itself is a deep,