More than a third of all North American bird species are at risk of becoming extinct unless significant action is taken, scientists who are part of a tri-nation initiative said on Wednesday, adding that ocean and tropical birds were in particular danger.
The study, compiled by the North American Bird Conservation Initiative and the first of its kind to look at the vulnerability of bird populations in Canada, the United States and Mexico, said 37 percent of all 1,154 species on the continent needed urgent conservation action.
The governments of Canada, the United States and Mexico created the . . .
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