Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2019 | Hobokense Polder | 21 march | Hobokense Polder | 15 may | |||||
| 2018 | Hobokense Polder | 31 march | Hobokense Polder | 19 april | |||||
| 2017 | Hobokense Polder | 28 march | Hobokense Polder | 26 october | |||||
| 2016 | Hobokense Polder | 2 april | Hobokense Polder | 4 october | |||||
| 2015 | Hobokense Polder | 5 april | Hobokense Polder | 2 may | |||||
| 2014 | Hobokense Polder | 15 march | Hobokense Polder | 27 october | |||||
| 2013 | Hobokense Polder | 30 march | Hobokense Polder | 5 may | |||||
| 2012 | Hobokense Polder | 8 april | Hobokense Polder | 7 october | |||||
| 2011 | Hobokense Polder | 16 april | Hobokense Polder | 23 october | |||||
| 2010 | Hobokense Polder | 18 april | Hobokense Polder | 29 september | |||||
| 2008 | Hobokense Polder | 20 october | Hobokense Polder | 20 october | |||||
| 2007 | Hobokense Polder | 7 october | Hobokense Polder | 27 october | |||||
| 2006 | Hobokense Polder | 27 october | Hobokense Polder | 27 october |
