More than a fifth of the planet's bird species face extinction as humans venture further into their habitats and introduce alien predators, an environmental group said on Wednesday.
While there have been some success stories of species that reappeared or recovered, the overall situation of the world's birds is worsening, BirdLife International said in its annual assessment of the feathered fauna.
"The total number (of bird species) considered to be threatened with extinction is now 1,212, which when combined with the number of near threatened species gives a total of exactly 2,000 species in trouble -- more than a fifth of the planet's remaining 9,775 species," BirdLife said.
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