FOOD OF BIUDS. 
15 
Family Graculid;e. Cormorant. 
Graculus (lilophus. Double-crested Cormorant. Migrant. Not common. 
« var> Floridanus. Florida Cormorant. Summer resident. Com- 
mon. 
The Cormorants feed almost exclusively on fish. 
Family Larid^j. Gulls, Terns, etc. 
Larns leucopte' us. White-winged Gull. Winter visitor. Rar^. 
“ marinus. Great Black-backed Gull. Winter visitor. Rare. 
“ argent at-us, var. Smitbsonianus Herring Gull. Migrant. Common. 
“ Delawarensis. Ring-billed Gull. Migrant. Common. 
“ tridactylus. Kittiwake Gull. Winter visitor. Rare. 
atricilla. Laughing Gull. Summer visitor. Not common. 
“ Pbiladelpbia. Bonaparte’s Gull. Migraut Common. 
Xeina Sabiuei. Fork- tailed Gull. Accidental in winter. 
Sterna angliea. Gull-billed Tern ; Marsh Tern. Migrant. Not common. ^ 
« birundo. Common Tern ; Sea Swallow. Migrant. Not common. 
Forsteri. Forster’s Tern. Migraut. Not common. 
“ macro lira. Arctic Tern. Migraut. Not common. 
“ paradissea, Roseate Tern. Migrant. Rare. 
“ superciliaris. Least Tern. Migrant. Not common. 
Hydrocbelidon fissipes Black Tern. Summer resident. Common. 
The food of the Gulls consists of fish, can ion, moll asks, spawn, worms, 
ants, moths and other insects, larvae and refuse. Ihe Terns feed upon 
small fish, grasshoppers, beetles, crickets, moths, spiders, and other in- 
sects. 
FamPy Colymbid^e. Loons. 
Colymbus torquatus. Loon ; Great Northern Diver. 
“ septenti ionalis. Red-throated Diver. Winter visitor. Not common. 
These feed chiefly upon fish, but also devour other aquatic animals, and 
sometimes vegetables. 
« 
Family Podicipid^e. Grebes. 
Podiceps cristatuS. Crested Grebe. Migrant. Not common. 
« greiseigena, var. Holbdili. Red-necked Grebe. Migrant. Not common. 
n cornutus. Horned Grebe. Migrant. Common. 
Podilymbus podiceps. Pied-billed Dabchick. Summer resident. Abundant, 
The Grebes feed upon fish, eels, mollusks, beetles, worms, and aquatic 
vegetables. 
Fiom the above it will be seen that birds may be divided into three 
classes those feeding entirely on animals, those whose food consists en- 
tirely of vegetable substances, and those which eat both. The latter 
class is the greatest, and the class comprising those feeding upon animals 
is larger than that of the vegetarians, which includes only the Paroquet 
and Pigeous. 
In view of the fact that great differences of form and structure are in- 
