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Journal Questions: Fill in the Chart

  1. What is the latest hatch date (the birthday of the youngest chick) in the Class of 2009? (Find out here. Remember how the birds are numbered.)
  2. BONUS: If they take off on October 10 as now planned, what will be the average age of the birds on the day they start migration? How does this year's average age compare to previous years?

 
YEAR LATEST HATCH DATE DEPARTURE DATE AVERAGE AGE AT DEPARTURE
2009 estimated:  
2008 June 15 Oct. 17 124 days
2007 June 10 Oct. 13 125 days
2006 May 31 Oct. 5 127 days
2005 June 3 Oct. 14 133 days
2004 June 5 Oct. 10 127 days
2003 May 23 Oct. 16 146 days
2002 May 21 Oct. 13 145 days
2001 May 24 Oct. 17 146 days
   
Total
 
   
Avg. Age at Departure
Check your answer. >>

From Joe Duff in Operation Migration's Field Journal

 

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