Each year in May, World Migratory Bird Day draws attention to the billions of birds that migrate long distances with the changing of the seasons, a living braid of ecosystems separated by thousands — even tens of thousands — of kilometers. According to Kariuki Ndang’ang’a, BirdLife International Africa’s regional director, about 2 billion birds fly along the African-Eurasian flyway every year: the populations of between 40 and 50 percent of these migratory bird species are in decline. Ndang’ang’a told Mongabay added that the birds that travel furthest are at greatest risk. Some species, like Abdim’s stork (Ciconia abdimii), migrate relatively short distances within the continent, but palearctic migrants — those coming from distant landscapes in Europe or Asia — are particularly vulnerable, experiencing over a 30% decline in the past 30 years. “Because these birds depend on specific stopover sites (like Lake Chad or the Nile Delta), the loss of even one small wetland can cause an entire population to collapse,” Ndang’ang’a wrote in an email. Abdim’s stork at Masai Mara NP, Kenya. Image by tsowerby via iNaturalist (CC BY-NC 4.0) According to Ndang’ang’a, habitat loss, climate change and infrastructure collision stand as three of the main reasons for the decline in migratory bird species. “For instance, the drainage of wetlands for agriculture or urban expansion has greatly affected migratory birds as they search for resting and feeding ground,” he said. Lake Chad, on the southern edge of the Sahara Desert, has lost 90% of its surface area since the…This article was originally published on Mongabay

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