Below are all months shown when black-headed gull migrated this year.
| august | |
|---|---|
| 1 | - |
| 2 | - |
| 3 | - |
| 4 | - |
| 5 | - |
| 6 | - |
| 7 | - |
| 8 | - |
| 9 | - |
| 10 | - |
| 11 | 359 |
| 12 | 101 |
| 13 | 494 |
| 14 | 98 |
| 15 | 113 |
| 16 | 41 |
| 17 | - |
| 18 | 8 |
| 19 | 401 |
| 20 | 235 |
| 21 | 43 |
| 22 | 67 |
| 23 | 7 |
| 24 | 197 |
| 25 | 318 |
| 26 | 298 |
| 27 | 351 |
| 28 | 16 |
| 29 | 25 |
| 30 | 15 |
| 31 | - |
| 3 187 | |
| september | |
|---|---|
| 1 | 7 |
| 2 | 11 |
| 3 | 66 |
| 4 | 4 |
| 5 | - |
| 6 | 47 |
| 7 | - |
| 8 | - |
| 9 | 3 |
| 10 | 11 |
| 11 | 34 |
| 12 | 40 |
| 13 | - |
| 14 | 10 |
| 15 | - |
| 16 | 70 |
| 17 | 67 |
| 18 | - |
| 19 | - |
| 20 | - |
| 21 | - |
| 22 | - |
| 23 | 19 |
| 24 | 111 |
| 25 | - |
| 26 | 28 |
| 27 | 50 |
| 28 | 16 |
| 29 | - |
| 30 | 3 |
| - | |
| 597 | |