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
Palatinate (colour) Palatinate (colour) Palatinate or 'palatinate purple' is a purple colour associated with Durham University. It is used in the academic dress of Durham University and in the faculties of medicine and law at Newcastle University (being a former college of Durham University). The term has been used to refer to a number of different shades of purple. The Oxford English Dictionary defines it as a "light purple or lavender colour", which is used for Durham (and Newcastle) academic hoods. For corporate purposes Durham University uses a darker shade. A separate colour, 'palatinate blue', is derived from the Coat of Arms