i6o 



BIRDS OF THE BRITISH EMPIRE. 



lias more white on wings, and the bill is very pale yellow, 

 almost white, and has a blood-red spot near the end of the 

 lower mandible. The legs and feet are grey, with a tinge 

 of flesh colour. Length, 2 feet 1 inch. 



Black-Headed Gull. — Bill dull orange, ring round eye 

 reddish orange, eye dark grey, head and upper part of 



In. \-2.— Th( (h-fatn- Black-Iiackid OuU. 



neck black ; general colour pale slate blue, dai-ker above 

 than below ; wing coverts white ; first primary black, with 

 white tip ; the next is white, edged outside with black. 

 Legs and feet vermilion. This species is easily tamed. 

 Length, 1 foot 5 inches. 



Common Tern.— The terns are distinguished by their 



