Gill, F., and D. Donsker, eds. 2013. IOC World Bird List (v 3.4). Available at http://www.worldbirdnames.org [Accessed 20 August, 2013]
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ITIS taxonomy is based on the latest scientific consensus available,
and is provided as a general reference source for interested parties.
However, it is not a legal authority for statutory or regulatory purposes.
While every effort has been made to provide the most reliable and up-to-date
information available, ultimate legal requirements with respect to species
are contained in provisions of treaties to which the United States is a
party, wildlife statutes, regulations, and any applicable notices that have
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legal requirements with respect to protected taxa, please contact the
U.S. Fish and Wildlife Service.