Below are all months shown when black-headed gull migrated this year.
| august | |
|---|---|
| 1 | - |
| 2 | - |
| 3 | - |
| 4 | - |
| 5 | - |
| 6 | - |
| 7 | - |
| 8 | - |
| 9 | - |
| 10 | - |
| 11 | 343 |
| 12 | 10 |
| 13 | - |
| 14 | 26 |
| 15 | 121 |
| 16 | 3 |
| 17 | 3 |
| 18 | 1 393 |
| 19 | 696 |
| 20 | 6 |
| 21 | 2 |
| 22 | 64 |
| 23 | 14 |
| 24 | 318 |
| 25 | 271 |
| 26 | 8 |
| 27 | 331 |
| 28 | 89 |
| 29 | 2 |
| 30 | 36 |
| 31 | 202 |
| 3 938 | |
| september | |
|---|---|
| 1 | 41 |
| 2 | 64 |
| 3 | - |
| 4 | 49 |
| 5 | 108 |
| 6 | 187 |
| 7 | 317 |
| 8 | 303 |
| 9 | 319 |
| 10 | 533 |
| 11 | - |
| 12 | - |
| 13 | - |
| 14 | 52 |
| 15 | 139 |
| 16 | 42 |
| 17 | 186 |
| 18 | - |
| 19 | - |
| 20 | 7 |
| 21 | 12 |
| 22 | 128 |
| 23 | 146 |
| 24 | - |
| 25 | 18 |
| 26 | 22 |
| 27 | 22 |
| 28 | 2 |
| 29 | - |
| 30 | 3 |
| - | |
| 2 700 | |