Plate XXXa {above). Gulls are above all scavengers. Here is a crowd of young and old 



birds (chiefly Herring-G ills and Lesser Black-backs) rushing to take oflfal at the fish wharf, 



Milford Haven {R. M. Lockky) . b {below left) Sabine's Gull, winter (Holland) {F. P. 3. Kooymans). 



c {below right) Black-headed Gull in winter plumage, Thames Estuary {R. M. Lockky) 



