Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2018 | Hobokense Polder | 20 october | Hobokense Polder | 20 october | |||||
| 2016 | Hobokense Polder | 14 april | Hobokense Polder | 21 april | |||||
| 2015 | Hobokense Polder | 30 april | Hobokense Polder | 27 october | |||||
| 2014 | Hobokense Polder | 15 march | Hobokense Polder | 15 march | |||||
| 2013 | Hobokense Polder | 27 september | Hobokense Polder | 28 september | |||||
| 2012 | Hobokense Polder | 8 april | Hobokense Polder | 30 september | |||||
| 2011 | Hobokense Polder | 17 april | Hobokense Polder | 29 october | |||||
| 2010 | Hobokense Polder | 28 april | Hobokense Polder | 28 april | |||||
| 2007 | Hobokense Polder | 7 october | Hobokense Polder | 27 october |
