This report, the first ever State of the World’s Migratory Species, provides a comprehensive overview and analysis of the conservation status of migratory species. It summarizes their current status and trends, identifies the key pressures they face, and highlights illustrative examples of the efforts underway to conserve and promote the recovery of these species. It aims to improve conservation outcomes for migratory species, by providing support for evidence-based decision-making by CMS Parties, and more broadly, by raising awareness of the challenges and success stories in the conservation of migratory species. The report was produced in response to a decision adopted at COP13 in 2020, which mandated that work be undertaken to further develop the preliminary review of conservation status submitted to COP13. The focus of this report is on those species listed in the CMS Appendices; however, as other migratory species may benefit from protection under CMS,  it also provides information on the wider group of all migratory species.