Below are all months shown when black-headed gull migrated this year.
| august | |
|---|---|
| 1 | - |
| 2 | 531 |
| 3 | 110 |
| 4 | 94 |
| 5 | 8 |
| 6 | 5 |
| 7 | 3 |
| 8 | 3 |
| 9 | - |
| 10 | 22 |
| 11 | 7 |
| 12 | 327 |
| 13 | 867 |
| 14 | 485 |
| 15 | - |
| 16 | 48 |
| 17 | 31 |
| 18 | 32 |
| 19 | 6 |
| 20 | - |
| 21 | 106 |
| 22 | 78 |
| 23 | 700 |
| 24 | 225 |
| 25 | 18 |
| 26 | 645 |
| 27 | 32 |
| 28 | - |
| 29 | - |
| 30 | - |
| 31 | - |
| 4 383 | |
| september | |
|---|---|
| 1 | 6 |
| 2 | 17 |
| 3 | 459 |
| 4 | 127 |
| 5 | - |
| 6 | - |
| 7 | - |
| 8 | 5 |
| 9 | 34 |
| 10 | 48 |
| 11 | 124 |
| 12 | 33 |
| 13 | - |
| 14 | - |
| 15 | - |
| 16 | 12 |
| 17 | 396 |
| 18 | 125 |
| 19 | - |
| 20 | 2 |
| 21 | 11 |
| 22 | - |
| 23 | 14 |
| 24 | 91 |
| 25 | 134 |
| 26 | 25 |
| 27 | 8 |
| 28 | - |
| 29 | 30 |
| 30 | 20 |
| - | |
| 1 721 | |