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Number of Days on the Wintering Grounds
Eastern Flock, First Ultralight-led Cranes to Depart
Year
Days Spent on Wintering Grounds
(
first birds to depart)
Class of 2010 70 days
(St. Marks)
75 days (Chassahowitzka)
Class of 2009 70 days
(St. Marks)
75 days (Chassahowitzka)
Class of 2008 72 days
(St. Marks)
60 days (Chassahowitzka)
Class of 2007 57 days
Class of 2006 (no ultralight-led survivors)
Class of 2005 106 days
Class of 2004 104 days
Class of 2003 113 days
Class of 2002 121 days
Class of 2001 126 days

 

Journal Questions
This chart includes 9 years of data. The number of days on the wintering grounds is calculated from the arrival date to the first bird's departure date.

  1. What fact statements can be made using the data included on this chart?
  2. What is the average number of days on the wintering grounds for the 9 years in which ultralight-led cranes have departed on spring migration?
  3. How might the year-to-year differences be explained?

 

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