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(26) the means of my four counts gave 516. We therefore agreed that there were over 500 pups in the rookery, or between 500 and 520 pups This result we were wholly unprepared for, as only 2 days previously we had a very satisfactory count which gave 416 pups as a maximum figure. Even admitting that this may have been slightly below the actual number we are well satisfied that the error cannot possibly have 203