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The number of tern nests in the Lower Great Lakes declined from approximately 4,000 in the 1976-1980 time period, to approximately 3,500 in the 1997-2000 time period.
The number of tern nests in the Upper Great Lakes declined from approximately 7,000 in the 1976-1980 time period, to approximately 5,200 in the 1997-2000 time period.