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Most of the differences in the size of the excavated Pogonomyrmex badius nests were associated with the number of workers actively digging. Only actively digging workers could be recaptured at the surface as they brought up soil to discard. Younger workers from deeper in the nest were rarely recaptured. Because replicates began with varying numbers of workers (125 to 250), digging rate is plotted against fraction recaptured.
