A Nesting Study of Spizella pallida

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Abstract
On a study area near Edmonton, Alberta, clay-colored sparrows occupied established breeding territories from about the middle of May to about the middle of July. Nest building started during the last week of May but did not occur after the end of June. Four eggs were usually laid. Incubation commenced with the laying of the 3rd egg and continued for 10 days. Young left the nest eight days after hatching and before they were capable of flight. Cowbird parasitism was not tolerated. Nestling losses were considerably lower than egg losses.

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