Editing Bird migration (section)

===In waders===
[[File:BartailedGodwit24.jpg |right |thumb |[[Bar-tailed godwit]]]]

A similar situation occurs with [[wader]]s (called ''shorebirds'' in North America). Many species, such as [[dunlin]] ''Calidris alpina''<ref>{{cite web |url=http://www.birdlife.org.uk/datazone/speciesfactsheet.php?id=3056 |title=Species factsheet: Dunlin Calidris alpina |publisher=BirdLife International |date=2014 |access-date=19 June 2014 |archive-date=12 August 2014 |archive-url=https://web.archive.org/web/20140812214214/http://www.birdlife.org.uk/datazone/speciesfactsheet.php?id=3056 |url-status=dead }}</ref> and [[western sandpiper]] ''Calidris mauri'',<ref>{{cite web |url=http://www.birdlife.org.uk/datazone/speciesfactsheet.php?id=3044 |title=Species factsheet: Western Sandpiper Calidris mauri |publisher=BirdLife International |date=2014 |access-date=19 June 2014 |archive-date=12 August 2014 |archive-url=https://web.archive.org/web/20140812214035/http://www.birdlife.org.uk/datazone/speciesfactsheet.php?id=3044 |url-status=dead }}</ref> undertake long movements from their Arctic breeding grounds to warmer locations in the same hemisphere, but others such as [[semipalmated sandpiper]] ''C. pusilla'' travel longer distances to the tropics in the Southern Hemisphere.<ref>{{cite web |url=http://www.birdlife.org.uk/datazone/speciesfactsheet.php?id=3043 |title=Species factsheet: Semipalmated Sandpiper Calidris pusilla |publisher=BirdLife International |date=2014 |access-date=19 June 2014 |archive-date=12 August 2014 |archive-url=https://web.archive.org/web/20140812224300/http://www.birdlife.org.uk/datazone/speciesfactsheet.php?id=3043 |url-status=dead }}</ref>

For some species of waders, migration success depends on the availability of certain key food resources at stopover points along the migration route. This gives the migrants an opportunity to refuel for the next leg of the voyage. Some examples of important stopover locations are the [[Bay of Fundy]] and [[Delaware River|Delaware Bay]].<ref>{{cite journal |last=Sprague |first=A. J. |author2=D. J. Hamilton |author3=A. W. Diamond |title=Site Safety and Food Affect Movements of Semipalmated Sandpipers (Calidris pusilla) Migrating Through the Upper Bay of Fundy |journal=Avian Conservation and Ecology |year=2008 |volume=3 |issue=2 |doi=10.5751/ACE-00252-030204 |doi-access=free}}</ref><ref>{{cite journal |last=Kathleen E. Clark, Lawrence J. Niles and Joanna Burger |title=Abundance and Distribution of Migrant Shorebirds in Delaware Bay |journal=The Condor |volume=95 |issue=3 |pages=694–705 |url=http://www.state.nj.us/dep/fgw/ensp/pdf/literature/abundance-distribution_shorebirds_delbay.pdf |doi=10.2307/1369612 |jstor=1369612 |year=1993}}</ref>

Some [[bar-tailed godwit]]s ''Limosa lapponica baueri'' have the longest known non-stop flight of any migrant, flying 11,000&nbsp;km from [[Alaska]] to their [[New Zealand]] non-breeding areas.<ref>{{cite journal |title=Crossing the ultimate ecological barrier: evidence for an 11,000&nbsp;km-long nonstop flight from Alaska to New Zealand and Eastern Australia by Bar-tailed Godwits |last=Gill |first=Robert E. Jr. |author2=Theunis Piersma |author3=Gary Hufford |author4=Rene Servranckx |author5=Adrian Riegen |journal=The Condor |year=2005 |volume=107 |issue=1 |pages=1–20 |doi=10.1650/7613 |hdl=11370/531c931d-e4bd-427c-a6ad-1496c81d44c0 |s2cid=84878931 |type=Submitted manuscript |url=https://www.rug.nl/research/portal/en/publications/crossing-the-ultimate-ecological-barrier(531c931d-e4bd-427c-a6ad-1496c81d44c0).html|doi-access=free }}</ref> Prior to migration, 55 percent of their bodyweight is stored as fat to fuel this uninterrupted journey.