TABLE C-16.--Number of birds, by species, 
highlands of Mexico, 
winter survey, January 1963 
Species 1963 
Ducks: 
Dabblers: 
Gadwall------~-.---- 
American widgeon--- 
Green-winged teal-- 
Blue-winged teal--- 
Shoveler----------=-- 
Pintail---------.-- 
Wood duck---------- 
Tree duck---------- 
Subtotal--------- 
Divers: 
Redhead------------ 
Canvasbac k-------=-- 
Ring-necked duck--- 
Goldeneye-------=-=- 
Bufflehead--------- 
Ruddy duck--------- 
Subtotal--------- 
Miscellaneous: 
Mer ganser---------- 
Unidentified-------~--- 

Total ducks-------- 119,027 
Geese: 
Snow and Blue----+---- 44,400 
White-fronted-------- 4,408 
Swans: 
Grand total-------- 179,184 
92 
11,561 

10 
558 
10 
100 
398 
1,076 
135 
12,561 
25,895 
7,841 
3,707 
13 

14,137 
51,593 
