634 AVES [CH. 



Division III. Carinatae. 



Without teeth, with a keeled sternum. 



Tribe 1. Colymbiformes (Divers and Grebes). Plantigrade, 

 nidifugous, aquatic, toes webbed. 



Ex. Colymbm, Diver; Podiceps, Grebe. 



Tribe 2. Sphenisciformes (Penguins). Nidicolous ; wings 

 transformed into rowing paddles ; feathers small and scale-like. 

 Ex. Spheniscus, Penguin. 



Tribe 3. Procellariiformes (Petrels). Nidicolous, good fliers, 

 pelagic; sheath of bill compound. 



Ex. Procellaria, Petrel; Puffinus, Puffin; Diomedea, 

 Albatross. 



Tribe 4. Ciconiiformes. Nidicolous ; swimmers or waders ; 

 desmognathous with basipterygoid processes. 



Ex. Sula, Gannet ; Pelecanus, Pelican ; Ardea, Heron ; 

 Ciconia, Stork ; Phoenicopterus, Flamingo. 



Tribe 5. Anseriformes (Ducks and Geese). Nidifugous; 

 desmognathous with basipterygoid processes ; with copulatory 

 organ; palate bearing hard, horny, parallel ridges. 



Ex. Anas, Duck ; Anser, Goose ; Cygnus, Swan. 



Tribe 6. Falconiformes (Birds of Prey). Nidicolous ; des- 

 mognathous ; beak powerful with decurved tip ; talons long 

 and curved. 



Ex. Falco, Falcon; Aquila, Eagle; Cathartes, Turkey- 

 Buzzard. 



Tribe 7. Galliformes (Game-Birds). Nidifugous; schizo- 

 gnathous. 



Ex. Gallus, Common Fowl; Phasianus, Pheasant; 

 Tetrao, Grouse. 



Tribe 8. Tinamiformes (Tinamous). Like Galliformes but 

 without pygostyle and with dromaeognathous palate. 

 Ex. Tinamus, Tinamou. 



Tribe 9. Gruiformes (Cranes and Rails). Waders, legs 

 long, nidifugous ; schizognathous. 



Ex. Rallus, Rail ; Fulica, Coot ; Grus, Crane. 



