CORRECT ANSWER:
Over 1850 bird species, or an estimated 19% of the 9865 known bird species,
are considered to be migratory. According to BirdLife
International , 11% of migratory birds are Globally Threatened or
Near Threatened and 31 are classified as Critically Endangered.
Although there are many serious threats for migratory birds, the way
humans use the land around them has by far the greatest effect. Unsustainable
human land use, whether through deforestation, mining, urbanization,
intensive agriculture or land reclamation directly removes or damages
migratory bird habitats on a global scale. Learn more about how land
use changes are affecting migratory birds on the WMBD
2011 website.
For more information and to learn how you can help please also see
the BirdLife Preventing Extinctions Programme Website at: http://www.birdlife.org/extinction/index.html
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How many species of migratory bird are there?
