The GREAT BLACK-BACKED GULL (_Larus marinus_), one of the best-known members of the above group, has the head, neck, under surface of the body, rump, and tail pure white; the upper back and wings are black; the wing-quills tipped with white. In young birds the head, neck, and under side are white, streaked and spotted with yellow and brown; the rump and wing-covers are brownish grey, with light edges; the quills and tail-feathers are black, the latter marked with white. The eye is silver-grey and the ring around it bright red. The beak is yellow, the under mandible being red towards its apex; the foot is light greyish yellow. The length of this species is twenty-eight inches, and breadth sixty-five inches; the wing measures nineteen, and the tail seven inches and a half. The Black-backed Gull frequents the shores of Europe, and, according to Audubon, is met with in North America. In Ireland it is a resident species, and is found dispersed in abundance along the English and Scotch coasts. It breeds in Caermarthenshire on sandy flats, in the British Channel on sandy islands or steep holms, and in the marshes near the mouth of the Thames. Dr. Edmondson says, "This species breeds on the flat grassy tops of a few inaccessible holms, or small islands--as the far-famed Cradleholm, of Ness--in considerable numbers, never in cliffs, and excludes every other bird from such localities. A pair or two--we may suppose the melancholy remnant of a more numerous race--may now and then be met with on lower and more accessible, but still flat situations." It usually produces three young, which, independently of their size, may be easily distinguished from other species by the more distinct speckling with black of their grey plumage. Like all the larger Gulls, it is fond of carrion. In winter these birds feed much on starfish, a meagre and frugal diet, it must be admitted; but the abundance of herrings, in summer, amply compensates for the abstinence of winter. When flocks of Shags are enjoying their gluttonous siesta on the rocks, a Black-backed Gull is very often perched near them, and on such occasions he acts as their sentinel by giving the alarm with his hoarse voice, or taking flight when an enemy endeavours to approach within shot. His deportment is dull and solitary. [Illustration: BLACK-BACKED AND HERRING GULLS.]