SAMARKAND, Uzbekistan & SHRINGAR, India, Mar 12 2026 (IPS) - Global wildlife is facing a deepening crisis as the latest United Nations assessment warns that nearly half of the world’s migratory species are in decline due to human activity, habitat destruction, and climate change.
The warning comes in the newly released State of the World’s Migratory Species: Interim Report 2026, which presents updated findings on population trends, conservation status, and emerging threats affecting animals that travel vast distances across continents and oceans.
Kelly Malsch, lead author of the State of the World’s Migratory Species: Interim Report 2026 and Head of Conservation, UNEP-WCMC.
Prepared by the UN Environment Programme World Conservation Monitoring Centre (UNEP-WCMC) for the Convention on the Conservation of Migratory Species of Wild Animals, the report provides a comprehensive snapshot of how species that rely on migration for survival are increasingly under pressure across ecosystems.
According to the report, “the extinction risk of CMS listed species is rising”, with migratory animals exposed to a combination of threats along their routes, including habitat loss, overexploitation, pollution, and climate change.
The assessment shows that almost one in four migratory species listed under the Convention on Migratory Species is now globally threatened. Updated evaluations from the International Union for Conservation of Nature reveal that 24 percent of these species fall into threatened categories such as Vulnerable, Endangered, or Critically Endangered.
One of the lead report authors, Kelly Malsch, who is also Head of Conservation, UNEP-WCMC told IPS news in an exclusive interview that the State of the World’s Migratory Species report, published in 2024, was the first comprehensive assessment of the situation facing migratory species. She says that the report identified overexploitation and habitat loss, degradation and fragmentation due to human activity as the two greatest threats to both CMS-listed and all migratory species. These main drivers remain unchanged since the first assessment.
“Since then, we find that 49 percent of migratory species populations conserved by the global UN treaty are declining (5 percent more in just two years, from 44 percent in 2024), and 24 percent of species face extinction (2 percent more, up from 22 percent in 2024),” Malsch said.
She added, “We do not know exactly how quickly these changes are happening, as the trends only come to light when the IUCN Red List for a particular species is updated. However, we do know populations of migratory animals are being lost at an alarming rate and that more needs to be done to turn things around for these amazing species given the changes in only two years.”
The report also notes that 34 species have shifted to a different risk category since the previous assessment. Of these, 26 species have moved into more threatened categories, while only seven have improved in status.
Many of the species moving toward greater risk are migratory shorebirds. Eighteen shorebird species have been reclassified into more threatened categories due to habitat degradation, climate impacts, and other human pressures.
The findings highlight the growing vulnerability of species that rely on multiple habitats across borders. Migratory animals often depend on breeding grounds, feeding sites, and stopover habitats located in different countries. Any disruption along these pathways can jeopardise their survival.
‘Action Needed to Improve Health of Biodiversity Globally’
The report also presents alarming trends in population decline. Nearly half of all migratory species assessed now show decreasing population trends.
According to the report, “the proportion of CMS listed species with a decreasing population trend now stands at 49 percent”, up from 44 percent previously recorded.
Scientists caution that the increase partly reflects improved monitoring data, but it still signals widespread ecological pressure across ecosystems.
Recent studies cited in the report confirm declining populations among migratory shorebirds, birds of prey across the African-Eurasian flyway, freshwater fish, sharks, and rays.
The global extinction of the Slender billed Curlew is one stark example of these trends. With no confirmed sightings since 1995, the species has now been declared extinct, underscoring the consequences of delayed conservation action. “Migratory species can be found around the world on land, in rivers, wetlands, at sea and in our skies – the declines we are seeing with this subset of species showcase that more action is needed to improve the health of biodiversity globally,” Malsch said.
Disease and threatened migratory routes affect birds. The Egyptian Vulture is affected by poisoning, electrocution, and poaching. Credit: Sergey Dereliev, (www.dereliev-photography.com)
Disease Outbreaks and Environmental Threats
In addition to habitat destruction and climate change, emerging threats such as disease outbreaks are affecting migratory wildlife.
The report notes that highly pathogenic avian influenza has caused mass mortality events among migratory birds and marine mammals recently. The virus has affected species ranging from African Penguins and pelicans to cranes and sea lions.
Researchers warn that long-lived migratory species are especially vulnerable to such disease outbreaks because even small increases in mortality can affect their long-term survival.
Infrastructure development is another major challenge. Expanding road networks, fences, pipelines, and railways are fragmenting migratory routes used by terrestrial mammals such as gazelles and wildebeest.
These barriers restrict seasonal movements that animals rely on to access breeding areas and food resources. In some cases, they have already triggered dramatic population declines.
Malsch said that to protect migratory paths that cross borders, the global conservation community needs to take actions that safeguard, link, and restore important habitats for these species – this means making sure that vital areas for migratory species (like Key Biodiversity Areas) are officially recognised as protected and conserved. Ensuring that these areas are effectively managed and connected.
“Ensuring ecological connectivity through wildlife corridors provides important stepping stones for migratory species. Wildlife corridors can exist at many different scales, ranging from wildlife overpasses that allow animals to safely cross roads to vast transboundary landscapes and seascapes that support migrations spanning thousands of miles. There is a need to understand where and how ecological corridors are already effectively conserving migratory species. UNEP-WCMC are working on a database of ecological corridors that will help the global conservation community with this challenge and crucially aid in identifying key gaps in the existing network,” Malsch said.
She added that there are various inspiring examples from around the world of collaborative initiatives focused on restoring connectivity at landscape scales.
The Wildlife Connect initiative – led by WWF and including CMS – is helping conserve the jaguar. Credit: Gregoire Dubois
“For example, the Wildlife Connect initiative – led by WWF and including CMS as a partner – works to protect and restore ecological connectivity across key landscapes, such as a focal landscape in the Pantanal-Chaco region – spanning Argentina, Bolivia, Brazil and Paraguay - where the initiative works across this large transboundary landscape to identify and protect ecological corridors for wide-ranging species like the Jaguar. ”
Severe Decline in Fish Populations
The report highlights migratory fish as one of the most threatened groups globally. Freshwater fish populations have declined by an average of 81 percent since 1970, according to the Living Planet Index cited in the study.
Habitat fragmentation caused by dams and river regulation is one of the primary drivers behind these losses. Large river basins such as the Amazon, Mekong, Congo, and Niger face increasing pressure from hydropower development, which disrupts migratory pathways for fish and other aquatic species.
Sharks and rays are also experiencing severe declines. Their populations have fallen by roughly half since 1970, largely due to overfishing and bycatch.
Scientists warn that several groups, including sawfishes, devil rays, and hammerhead sharks, are now among the most threatened vertebrates in the oceans.
Signs of Conservation Success
Despite the overall negative outlook, the report highlights several conservation successes that demonstrate the impact of coordinated global efforts.
The Saiga Antelope, once devastated by disease outbreaks and poaching, has shown a strong recovery in parts of Central Asia. The species has improved from Endangered to Near Threatened due to strengthened anti-poaching efforts, habitat protection, and community engagement in Kazakhstan.
Another success story is the Scimitar horned Oryx. Once extinct in the wild, the species has been reintroduced in Chad and now maintains a growing wild population of more than 500 individuals.
Marine turtle populations also show encouraging trends. Many nesting populations are now stable or increasing due to conservation measures such as protected nesting beaches and reduced hunting.
“As many river systems flow across international borders, governments can come together multilaterally and take urgent, coordinated efforts to reverse declines in freshwater migratory fish populations. While advocating for specific interventions is beyond the scope of this report, the first State of the World’s Migratory Species report highlighted a range of recommendations, including the urgent need to minimise the impacts of planned infrastructure on migratory species. Restoration efforts also have an important role to play,” Malsch said.
According to her, in river systems that have been badly fragmented by dams, restoration could involve the removal of barriers at strategic locations. For some species, the effects of barriers can be reduced by adding fish passages or by adjusting how dams operate to keep natural water flows, like maintaining proper water levels in downstream areas or important floodplain habitats.
Migratory fish would also benefit from measures to reduce water pollution and to ensure any fishing pressure is sustainable, through measures such as the seasonal closure of fisheries or protections at key spawning grounds, or improved monitoring of cross-border populations.
“There are clear actions that can be taken to improve outcomes for freshwater fish, but we need to act with pace,” she said.
Critical Habitats Still Underprotected
Scientists, as per the report, have identified thousands of important biodiversity sites worldwide. Of the 16,589 Key Biodiversity Areas globally, more than 9,300 have been identified as important for migratory species. Yet many of these locations remain inadequately protected. On average, only about 52.6 percent of the area within these critical habitats is currently covered by protected or conserved areas.
This gap leaves many species vulnerable during crucial stages of their migration cycles. Experts say that better mapping of migratory routes and stronger international cooperation are essential for safeguarding wildlife that crosses multiple national borders. The report calls for intensified global action to protect migratory wildlife and their habitats by 2032 under the Samarkand Strategic Plan for Migratory Species.
Conservation measures must focus on restoring habitats, protecting migratory corridors, reducing overexploitation, and addressing the impacts of climate change. “Action to restore, connect and protect important habitats and reduce the pressures facing migratory species is urgently required to secure their future,” the report reads. It adds that without coordinated international action, many of the planet’s most remarkable animal migrations could disappear within a generation.
“Recovery is possible when countries come together to take urgent, coordinated action to protect species. Malsch stated, “We know conservation works when focused efforts reduce underlying pressures head-on and consider the local context.”
She added that for Saiga, protection of key habitats and dedicated efforts to tackle poaching in a coordinated way have allowed this unique species to bounce back. For marine turtles, progress has been made to protect nesting beaches, prevent and reduce the direct taking of turtle eggs and adjust fishing gear to reduce bycatch of marine turtles.
“This combination of dedicated actions by governments, coastal communities, and fishermen is making all the difference. These are the types of focused approaches, directly targeting the main pressures, that need to be replicated to help other species.”
IPS UN Bureau Report
