NEST MONITORING RESULTS

ANNUAL trends in breeding success calculated using NRS data are reported annually in the BirdTrends Report (www. bto.org/birdtrends) for 90 species. The information obtained from the records includes a laying date, back-calculated from observations of eggs and chicks, clutch and brood sizes and nest failure rates, all of which are combined to produce an estimate of the number of fledglings produced during the average breeding attempt.