International Crane Foundation (ICF):  Red-crowned Cranes
http://www.savingcranes.org/redcrownedcrane.html

USGS, Northern Prairie Wildlife Research Center
http://www.npwrc.usgs.gov/resource/birds/cranes/grusjapo.htm

Wikipedia: Red-crowned Cranes
http://en.wikipedia.org/wiki/Red-crowned_crane

Bird-life International: Red-crowned Cranes
http://www.savingcranes.org/species/red_crowned.cfm

Bird-life International: Red Data Book – Red-crowned Cranes
https://www.globalconservation.info/rudy/detailbird.php?id=57

You Tube (videos) of Red-crowned Cranes
http://www.youtube.com/watch?v=_lRosXiLPAs
http://www.youtube.com/watch?v=WBLGPFQLeAk