Northern Prairie Wildlife Research Center
Figure 2 -- Diagrammatic search pattern of a hypothetical field.
Figure 3 -- Examples of a proper and improper interval and alignment while
towing a cable-chain drag in field searches.
Figure 4 -- Proper positioning of a duck egg for field candling is demonstrated.
Figure 5 -- Characteristics of duck eggs candled during different stages of
Figure 6 -- Detached membranes are visible in these hatched eggs.
Figure A-1 -- Examples of distinguishing breast feathers of 10 species of ducks found nesting in uplands in the prairie pothole region:
Table 1 -- Percent of nests found in south-central North Dakota in 1976 using
varying numbers and timing of search schedules.
Table B-1-- Mean values for clutch sizes, incubation terms, and age of clutches.
Table B-2 -- Computation of exposure days for nests with different survival
and visitation intervals.
Table B-3 -- Three methods for calculating nest success.