Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2018 | Winter Hill, Bolton (Gtr Manc/Lancs, England) | 30 November | Winter Hill, Bolton (Gtr Manc/Lancs, England) | 30 November | |||||
| 2015 | Winter Hill, Bolton (Gtr Manc/Lancs, England) | 1 October | Winter Hill, Bolton (Gtr Manc/Lancs, England) | 1 October | |||||
| 2011 | Winter Hill, Bolton (Gtr Manc/Lancs, England) | 5 November | Winter Hill, Bolton (Gtr Manc/Lancs, England) | 5 November |
