The State of the World's Migratory Species, a first of its kind report compiled by conservation scientists under the auspices of the U.N. Environment Programme's World Conservation Monitoring Centre, found population decline, a precursor to extinction, in nearly half of the roughly 1,200 species listed under the Convention on Migratory Species (CMS), a 1979 treaty aimed at conserving species that move across international borders.
The report found that an additional 399 migratory species not covered by the treaty, including mammals, birds, and reptiles, are also at risk.
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