ae _Age 1939 1946 19LT 19L2 1943 19bh 1945 1946 Total 
Table 55.~-First-season Recovery Rates of Mallards 
Canadian birds were banded before September 1 (except as noted) and 
were recovered in the hunting season that followed; Illinois band- 
ings continued through the hunting seasons; not included among the 
recoveries are birds retrapped by banders, those fatally injured 
in banding operations, and those caught in mammal traps. 

No. bande juv. 19 352 2h 68 604 903 78h 754 3728 
No. recovered h 39 20 8 31 83 .80 72 337 
Recovery rate - 1112 82 - 5.1 9.2 102 25 9.0 
O- ea adult | 4 
No. recovered 1 36 ir 7 27 88 103 .26 292 
Recovery rate - 1.5 21 + 6.9 12.9 10.3 8.9 9.93 
No. bande a 4 
No. recovered Ages 5 75 2h 15 58 171 183 98 £629 
Recovery (a) -~ 113 55 119 5.8 108 102 94 9 
rate (b) 8.9 57 6) 
NORTHEAS 
Males banded juv. — 
No. recovered 
Recovery rate 8.7 = 8.7 51 105 101 7.6 7.9 
Males banded adult B, #9 350 630 330 Of 333. ond. 
No. recovered 
Recove rate 
No. bande a 
No. recovered ages 3/ 
183 116 7781290 637 819 523 43h6 
146 5S 68 66 67 83 \4O 345 
3 j 
4 h 28 2h 37 #43 17° 157 
- - 80 3.8 11.2 64 S1 63 
I 
39 16 16 182 168 198 111 $830 
Recovery rate - 8&1 51 %7.8 Sl 9h 87 6.8 7.3 
ILLINOIS RIVER VALLEY RECOVSRY RATES L/ 
Mallard only all 2.96.8 2.6 5.7 = = as 2 2 
3 species azes 1.8 5.0 1.8 3.0 = = = = - 
OUR By Noe 
No. banded all 918 1566 1619 - = = = = 4103 
No. recovered ages 1hO 222 143 - = - - - 50s 
Recovery rate 15.3 14.2 88 - -= = = - 12.3 
' By Ducks Unlimite anada). Noted under are recovery rates 
2/ 
3/ 
/ 
g/ 
for unaged birds reported by B. W. Cartwright to Rellrose (19h); 
these rates presumably include birds banded during the hunting 
seasone 
Banding work mostly by John Jedlicka for the Forest Preserve Dis- 
trict of Cook Co., Ill. : 
Includes females and unaged birds not shown in this table. The 
recovery totals differ unimportantly from those reported by Mann, 
Thompson, and Jedlicka (1947). 
From Bellrose (19h). 
Mallards, black ducks, and pintails banded in large numbers by: the 
Illinois State Natural History Survey; from Bellrose (19hh). 
Banding work by C. J. Henry and Merrill Hammond mostly during the 
hunting season. 
127 
