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
On a Pale Horse readers come to terms with the inevitable end of life." On a Pale Horse On a Pale Horse is a fantasy novel by Piers Anthony, first published in 1983. It is the first of eight books in the Incarnations of Immortality series. The book focuses on Zane, a photographer about to commit suicide who instead kills Death and must assume his office. The title is derived from the sixth chapter of Book of Revelation, in which one of the Four Horsemen of the Apocalypse, Death, rides upon a pale horse. The book spawned a five-issue comic series, released by Innovation