Below are all months shown when black-headed gull migrated this year.
| august | |
|---|---|
| 1 | - |
| 2 | - |
| 3 | - |
| 4 | - |
| 5 | - |
| 6 | - |
| 7 | - |
| 8 | - |
| 9 | - |
| 10 | - |
| 11 | 2 |
| 12 | 22 |
| 13 | 39 |
| 14 | 10 |
| 15 | 8 |
| 16 | 69 |
| 17 | - |
| 18 | 14 |
| 19 | 238 |
| 20 | 100 |
| 21 | - |
| 22 | 10 |
| 23 | 69 |
| 24 | 2 |
| 25 | - |
| 26 | - |
| 27 | - |
| 28 | - |
| 29 | 299 |
| 30 | 236 |
| 31 | 32 |
| 1 150 | |
| september | |
|---|---|
| 1 | - |
| 2 | - |
| 3 | - |
| 4 | 18 |
| 5 | 62 |
| 6 | 172 |
| 7 | 86 |
| 8 | 3 |
| 9 | - |
| 10 | - |
| 11 | 104 |
| 12 | - |
| 13 | 139 |
| 14 | 4 |
| 15 | 6 |
| 16 | - |
| 17 | - |
| 18 | 19 |
| 19 | 34 |
| 20 | 35 |
| 21 | - |
| 22 | 19 |
| 23 | 7 |
| 24 | 23 |
| 25 | - |
| 26 | 21 |
| 27 | - |
| 28 | 63 |
| 29 | 17 |
| 30 | 13 |
| - | |
| 845 | |