TABLE C-17.--Number of birds, by species, southern interior of Mexico, 
winter survey, January 1963 
Species 
Ducks: 
Dabblers: 
American widgeon--- 
Green-winged teal-- 
Blue-winged teal--- 
Shoveler-----+----- 
Pintail------------ 
Wood duck---------= 
Tree duck---<-<-+-- 
Subtotal-------+- 
Divers: 
Redhead ----<=--s-<- 
Canvasback=-----=+= 
Ring-necked duck--- 
Goldeneye---------- 
Bufflehead---=+----- 
Ruddy duck--------- 
Subtotal--------- 
Unidentified--------- 
Total ducks---+---- 
Geese: 
Swans: 
Whistling------------ 
Trumpter---~--------- 
Grand total--~----- 
1963 1962 
102,400 
1,925 
200 
90 









93 
183,157 
1,345 
4, 330 
360 



Percent 
change 
from 1962 


















T-year 
aver= 
age 
8 
4,227 
12,221 
34,860 
31,499 
33,256 
Lh 237 
1335952 
1h 

300, 274 

155 
11,607 
31967 
8 
1,658 
317,675 
1,122 
Percent 
change 
from 7-year 
average 
—33 
~15 
