This dataset contains concentrations of Persistent Organic Pollutants (POPs) and mercury (Hg) in merlin and golden eagle egg contents collected as part of the Predatory Bird Monitoring Scheme (PBMS). In addition to residue data, for each record the year and region in which the egg was collected, and the egg shell index are recorded. The PBMS is a long-term, national monitoring scheme that quantifies the concentrations of contaminants in the livers and eggs of selected species of predatory and fish-eating birds in Britain. Levels of contaminants are monitored to determine variations between species and regions, changes over time and effects on individual birds and their populations. The Scheme is currently funded by CEH, Natural England, the Environment Agency (EA) and the Campaign for Responsible Rodenticide Use (CRRU). Full details about this dataset can be found at https://doi.org/10.5285/ad38a087-01a3-4865-b07c-a088ffb65916

This is a dataset generated from information extracted from previously published studies, for the purpose of a meta-analysis investigating fitness benefits of different migratory strategies in partially migratory populations. Each line of data includes a mean and associated variance for a given fitness metric for both migrants and residents extracted from a study, in addition to information concerning population location, study species, type of fitness metric, year data were collected, and details on the publication from which the data were obtained. Data were collected as part of a NERC-funded PhD project, grant number NE/L002582/1. Full details about this dataset can be found at https://doi.org/10.5285/1a4e8d59-e112-4de6-a06b-9ea47ff15815