127 
low hatching success-ratio was attributed mainly to mammalian predation. Peak of 
hatch was estimated to be the week of April 23-29, 
A search of four small islands of the best nesting habitat in Blackfoot 
Reservoir in Caribou County was made on May 19 with the assistance of Bizeau and 
Steel. The area was re-checked on June 20. The peak of hatch was estimated to 
occur during the week of May 21-27, almost one month later than in the other two 
areas. The Reservoir is approximately 3,500 feet higher than the two river areas. 
The average hatch for this area this year is considerably higher than that recorded 
previously by Jensen and Nelson in Special Scientific Report: Wildlife No. 2, U.S. D.I. 
and Canada Department of Mines and Resources. 
- Banding 
In cooperation with Hortin Jensen, a successful Canada goose banding 
operation was carried out on June 28 at Blackfoot Reservoir. The geese were slowly 
driven by boats into a large wing trap. 
_ Alimited amount of early fall banding was done at North Lake Refuge in 
Jefferson County. Baited traps were used here. The banding results at both areas 
are shown in Table 2. 
Table 1. -- A Comparison of Canada Goose Nesting Success at Three Areas 
in Idaho, 1950 


Homedale Glenns Ferry Blackfoot 
Reservoir 
No. Nests Found | 26 26 46 
No. Nest Histories Completed 22 26 42 
No. Successful Nests 15 (68%) 10 (38%) 32 (76%) 
No. Nests Deserted or Destroyed 7 (32%) 16 (62%) | 10 (24%) 
Av. Clutch Successful Nest 5.8 5.2 4.9 
Av. Hatch Successful Nest 4.5 5.0 4.5 

Table 2. -- Idaho Banding Data, Summer 1950 

BR - Blackfoot Reservoir 
NLR - North Lake Refuge 
Species and Area Male Female Total 
Ad. Imm. Ad, Imm. 
a 
Canada goose j 188 8 225 a 426 
BR | 
Mallard 52 39 20 44 155 
NLR 
Pintail 5 ll 12 11 39 
_ NLR 
G-w. teal 3 I Pics 
NLR 
B-w./Cinn, teal 1 3 4 
NLR ; 
'B-w. teal l 
. NLR _ ; 
Baldpate 1 
NLR 
