Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2018 | Hobokense Polder | 20 october | Hobokense Polder | 20 october | |||||
| 2017 | Hobokense Polder | 1 october | Hobokense Polder | 1 october | |||||
| 2016 | Hobokense Polder | 22 april | Hobokense Polder | 22 april | |||||
| 2015 | Hobokense Polder | 23 april | Hobokense Polder | 23 april | |||||
| 2014 | Hobokense Polder | 16 march | Hobokense Polder | 23 october | |||||
| 2013 | Hobokense Polder | 3 may | Hobokense Polder | 29 september | |||||
| 2012 | Hobokense Polder | 23 april | Hobokense Polder | 23 april | |||||
| 2010 | Hobokense Polder | 18 april | Hobokense Polder | 18 april | |||||
| 2009 | Hobokense Polder | 5 october | Hobokense Polder | 5 october | |||||
| 2006 | Hobokense Polder | 5 november | Hobokense Polder | 5 november |
