2 A PRACTICAL HANDBOOK OF BEITISH BIRDS. 



( Cutting-edges of bill smooth or festooned, but not lamellated or sharply 



3 ' serrated -4 



' Cutting-edges of bill lamellated or strongly serrated 20 



Wigeon (Anas penelope), to show lamellated cutting-edges of bill. 



. f Legs inserted near vent, far behind middle of body 

 <. Lea's inserted about middle of bodv 



Legs inserted about middle of body 



/ Hind toe present Colymbi (Grebes and Divers) 



\ TTiT 



A. Great Crested Grebe (Colymbus cristatus). 



B. Red-throated Diver (Gavia stellata) . 



C. BlucV GniWemot (Uria grylle) . 



Anterior toes not or only incompletely ^/ 

 webbed 7 



Anterior toes fully webbed : 



Lari (Terns, Gulls, and Skuas). 



Black-headed Gull 

 {Laru sridibundus) 



