Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2019 | Hobokense Polder | 30 march | Hobokense Polder | 30 march | |||||
| 2018 | Hobokense Polder | 19 april | Hobokense Polder | 19 april | |||||
| 2016 | Hobokense Polder | 29 october | Hobokense Polder | 29 october | |||||
| 2015 | Hobokense Polder | 25 october | Hobokense Polder | 25 october | |||||
| 2011 | Hobokense Polder | 15 october | Hobokense Polder | 15 october | |||||
| 2008 | Hobokense Polder | 4 october | Hobokense Polder | 11 october | |||||
| 2007 | Hobokense Polder | 2 october | Hobokense Polder | 12 november | |||||
| 2006 | Hobokense Polder | 29 october | Hobokense Polder | 5 november |
