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Migratory species are vital components of global biodiversity and play an important role in maintaining ecological balance across ecosystems. However, recent assessments indicate that many migratory species are facing growing threats due to human activities and environmental changes. The latest interim update to the State of the World’s Migratory Species Report warns that nearly half of the world’s migratory species populations are declining, highlighting the urgent need for stronger international conservation efforts.

About the State of the World’s Migratory Species Report

The State of the World’s Migratory Species Report is a global scientific assessment that evaluates the conservation status, population trends, and threats facing migratory animals worldwide. The report is prepared under the Convention on the Conservation of Migratory Species of Wild Animals (CMS), an international treaty established in 1979 under the United Nations Environment Programme (UNEP). CMS provides a framework for international cooperation to conserve migratory wildlife and their habitats across national boundaries.

The first comprehensive global report was released in 2024, covering 1,189 species listed under CMS and analysing trends among more than 3,000 additional migratory species worldwide. The assessment relies on scientific data from sources such as the International Union for Conservation of Nature (IUCN) Red List, population monitoring studies, and peer-reviewed scientific literature.

Importance of Migratory Species

Migratory species contribute significantly to ecosystem functioning and human livelihoods. Migratory birds help in pollination, seed dispersal, and pest control, while marine animals such as whales and fish support marine food chains and nutrient cycling. Large migratory mammals distribute nutrients across landscapes and influence vegetation patterns.

These species also hold economic and cultural importance, supporting tourism, food systems, and traditional practices in many regions. However, migration makes species highly vulnerable, as the loss of even a single habitat along their migration route can disrupt entire ecological networks. Effective conservation therefore requires coordinated action across multiple countries and ecosystems.

Major Findings of the Latest Report

1. Declining Populations of Migratory Species

The report highlights worrying global trends in migratory wildlife populations. Approximately 49% of migratory species protected under CMS are experiencing population declines, while about 24% face a risk of extinction. Compared to earlier assessments, the proportion of declining species has increased by around five percentage points within two years, indicating an accelerating conservation crisis. Out of the 1,189 CMS-listed species, about 582 species show declining population trends.

2. Rising Extinction Risks

The assessment also notes that 26 migratory species have moved to higher extinction-risk categories on the IUCN Red List. Among them, 18 species are migratory shorebirds, highlighting severe threats to coastal and wetland ecosystems. Species affected include birds such as cranes and pelicans, ungulates such as wildebeest, freshwater fish species, and marine animals including sharks, rays, and sea turtles.

3. Habitat Loss and Overexploitation

The report identifies habitat loss and overexploitation as the most significant threats to migratory species. Activities such as urban expansion, agricultural development, infrastructure construction, overfishing, and hunting have disrupted migratory routes and degraded critical habitats.

Large infrastructure projects such as roads, railways, pipelines, and fences are increasingly blocking migration corridors, particularly for large terrestrial mammals in regions such as Central Asia. Since migratory species depend on multiple habitats across countries, the destruction of even one site along their migration pathway can jeopardise their survival.

4. Emerging Threat of Avian Influenza

Another emerging threat highlighted in the report is Highly Pathogenic Avian Influenza (H5N1). Disease outbreaks have caused large-scale mortality events among several migratory bird populations and have even affected marine mammals. Species impacted include African Penguins, Humboldt Penguins, Peruvian Pelicans, and Red-crowned Cranes. Marine mammals such as the South American Sea Lion and South American Fur Seal have also been affected, indicating the growing ecological impacts of disease outbreaks.

Conservation Progress and Key Biodiversity Areas

Despite these concerning trends, the report identifies several conservation successes. Seven migratory species listed under CMS have shown improvements in conservation status, including the Saiga Antelope, Scimitar-horned Oryx, and the Mediterranean Monk Seal. These cases demonstrate that coordinated international conservation measures can effectively restore threatened species populations.

The report also highlights the significance of 9,372 Key Biodiversity Areas (KBAs) that serve as critical habitats for migratory species. However, 47% of these areas currently lack formal protection, making them vulnerable to human pressures and habitat degradation.

Conclusion

The State of the World’s Migratory Species Report underscores the growing conservation crisis facing migratory wildlife. Declining populations, rising extinction risks, habitat loss, overexploitation, and emerging diseases collectively threaten the survival of many species. Addressing these challenges requires strengthened international cooperation, protection of migratory corridors and key biodiversity areas, and sustainable management of ecosystems. Ensuring the conservation of migratory species is essential not only for preserving biodiversity but also for maintaining ecological balance and supporting human livelihoods across the globe.