US Fish and Wildlife Service (USFWS) (2005): New arrivals to Midway Atoll NWR provide “insurance” against extinction for nation’s rarest duck. News Release, Oct 28. PDF fulltext (页面存档备份,存于互联网档案馆)
US Geological Survey (USGS) (2006b): Midway Atoll national Wildlife Refuge welcomes second generation of nation’s rarest ducks. News release, May 23. PDF fulltext (页面存档备份,存于互联网档案馆)
ecos.fws.gov
US Fish and Wildlife Service (USFWS) (2004): Draft Revised Recovery Plan for the Laysan Duck (Anas laysanensis). Portland, OR. PDF fulltext (页面存档备份,存于互联网档案馆)
US Geological Survey (USGS) (2005): Translocation of Endangered Laysan Ducks to Midway Atoll National Wildlife Refuge (2004-5). Fact sheet 2005-3128. PDF fulltext (页面存档备份,存于互联网档案馆)
usgs.gov
US Geological Survey (USGS) (2006c): Endangered duck population reaches triple digits! News release, Oct 23. HTML fulltext (页面存档备份,存于互联网档案馆)
US Fish and Wildlife Service (USFWS) (2004): Draft Revised Recovery Plan for the Laysan Duck (Anas laysanensis). Portland, OR. PDF fulltext (页面存档备份,存于互联网档案馆)
US Geological Survey (USGS) (2005): Translocation of Endangered Laysan Ducks to Midway Atoll National Wildlife Refuge (2004-5). Fact sheet 2005-3128. PDF fulltext (页面存档备份,存于互联网档案馆)
US Fish and Wildlife Service (USFWS) (2005): New arrivals to Midway Atoll NWR provide “insurance” against extinction for nation’s rarest duck. News Release, Oct 28. PDF fulltext (页面存档备份,存于互联网档案馆)
US Geological Survey (USGS) (2006c): Endangered duck population reaches triple digits! News release, Oct 23. HTML fulltext (页面存档备份,存于互联网档案馆)
US Geological Survey (USGS) (2006b): Midway Atoll national Wildlife Refuge welcomes second generation of nation’s rarest ducks. News release, May 23. PDF fulltext (页面存档备份,存于互联网档案馆)