Graph

Country
Migration site
Species
Period    
Sex
 Age
 Plumage
Present
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Don't use roostmigration

Year Totals Observation hours
1997 0 39:30
1999 3 19:00
2001 106 594:30
2002 0 0:00
2005 14 77:15
2006 3 32:05
2007 5 88:45
2008 6 100:00
2009 3 52:20
2010 22 48:05
2011 2 88:24
2012 32 36:20
2013 11 37:30
2014 0 30:40
2015 5 44:40
2016 3 163:00
2017 159 179:29
2018 14 380:50
2019 102 344:15
2020 36 447:51
2021 81 462:39
2022 110 482:00
 
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