Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Batumi - Sakhalvasho | 28 August | Batumi - Sakhalvasho | 22 September | |||||
| 2022 | Batumi - Sakhalvasho | 20 March | Batumi - Sakhalvasho | 20 October | |||||
| 2021 | Batumi - Sakhalvasho | 17 August | Batumi - Sakhalvasho | 21 October | |||||
| 2020 | Batumi - Sakhalvasho | 2 March | Batumi - Sakhalvasho | 23 May | |||||
| 2019 | Batumi - Sakhalvasho | 23 March | Batumi - Sakhalvasho | 21 October | |||||
| 2018 | Batumi - Sakhalvasho | 14 April | Batumi - Sakhalvasho | 14 October | |||||
| 2017 | Batumi - Sakhalvasho | 19 August | Batumi - Sakhalvasho | 14 October | |||||
| 2016 | Batumi - Sakhalvasho | 23 August | Batumi - Sakhalvasho | 15 October | |||||
| 2015 | Batumi - Sakhalvasho | 19 August | Batumi - Sakhalvasho | 16 October | |||||
| 2014 | Batumi - Sakhalvasho | 1 September | Batumi - Sakhalvasho | 16 October | |||||
| 2013 | Batumi - Sakhalvasho | 29 August | Batumi - Sakhalvasho | 15 October | |||||
| 2012 | Batumi - Sakhalvasho | 18 August | Batumi - Sakhalvasho | 28 October | |||||
| 2011 | Batumi - Sakhalvasho | 28 August | Batumi - Sakhalvasho | 15 October | |||||
| 2010 | Batumi - Sakhalvasho | 4 September | Batumi - Sakhalvasho | 10 October | |||||
| 2009 | Batumi - Sakhalvasho | 29 August | Batumi - Sakhalvasho | 6 October | |||||
| 2008 | Batumi - Sakhalvasho | 23 August | Batumi - Sakhalvasho | 10 October |
