Graph

Country
Migration site
Species
Period    
Sex
 Age
 Plumage
Present
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Year Totals Observation hours
2006 3 23:40
2007 1 71:05
2008 2 94:25
2009 0 91:45
2010 8 159:55
2011 7 208:42
2012 1 196:45
2013 5 239:26
2014 5 218:15
2015 0 145:35
2016 0 217:52
2017 3 191:09
2018 4 243:43
2019 9 191:56
2020 0 108:23
2021 3 156:10
2022 0 112:25
2023 0 12:15
 
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