FAMILY PODICIPID®. GREBES. 25 
WATER BIRDS. 
LNG SNOW Ol) So hers 2) ONG mse 
FAMILY PODICIPID-E. 
Grebes. 
Toes, four; three in front, one behind, with lobate webs. 
Podiymbus podicepe 
* Group |. Wing, less than 6.50 inches long. 
Depth of bill at base of culmen, over .40. Jn swnmer: Bill, with black band; throat, 
black. 
In winter: Bill, without black band; throat, white. 
Podilymbus podiceps. Pied-billed Grebe. Hell Diver. 
See No. 4. 
Depth of bill at base of culmen, less than .40. Jn summer: Two small tufts of 
brownish gray or buff-colored feathers behind the eye; crown, nape, and throat, black. 
In winter: Plain colored, without black or buff on head; upper plumage, grayish black; 
underparts, silvery white, often tinged with ash gray on throat and sides. 
Colymbus auritus. Horned Grebe. 
See No. 2. 
* Group 2. Wing, over 6.50 inches long. 
In summer: Crown, black; upper throat, gray; lower throat and breast, chestnut rufous: 
rest of underparts, silvery grayish white, : 
In winter: No rufous brown on throat or breast. Colymbus holbelli. Holboell’s Grebe. 
See No. 1. 
———— 
* For directions for measurement, see page 9. 
