Here I have demonstrated that a much larger number of bird species perform migratory
movements than any previous systematic description has depicted to date. I have also shown that it is possible to detect patterns of migrants in datasets systematically, and I have explored bias in effort in the largest single source of data of global avian occurrence. I envisage that the work I present here will be used to inform decision makers, the general public and scientists, and will help to inform better extinction risk assessments and conservation decisions. My thesis also provides robust methodological foundations and data on which future researchers can build. Ultimately, I hope that the eventual impact of my work is that migratory birds are better protected and that researchers in the future are better equipped to efficiently improve the accuracy and precision of their results in this field.
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