Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2018 | Winter Hill, Bolton (Gtr Manc/Lancs, England) | 20 March | Winter Hill, Bolton (Gtr Manc/Lancs, England) | 19 October | |||||
| 2017 | Winter Hill, Bolton (Gtr Manc/Lancs, England) | 16 October | Winter Hill, Bolton (Gtr Manc/Lancs, England) | 13 November | |||||
| 2013 | Winter Hill, Bolton (Gtr Manc/Lancs, England) | 14 September | Winter Hill, Bolton (Gtr Manc/Lancs, England) | 14 September | |||||
| 2011 | Winter Hill, Bolton (Gtr Manc/Lancs, England) | 18 September | Winter Hill, Bolton (Gtr Manc/Lancs, England) | 29 September |
