Monitoring results outside the Ark

monitoring graph uncontrolled

The comparison between this and the results from within the Ark is striking confirmation of the effectiveness of the rodent control. Some of the variability shown above does not have an obvious explanation, but some can be explained in terms of the normal cycle of rat populations, where there is a large decrease in numbers during the winter, and a steady build up during the summer to a peak in late summer and autumn.

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