Below are all months shown when black-headed gull migrated this year.
| august | |
|---|---|
| 1 | - |
| 2 | - |
| 3 | - |
| 4 | - |
| 5 | - |
| 6 | - |
| 7 | - |
| 8 | - |
| 9 | - |
| 10 | - |
| 11 | 564 |
| 12 | 227 |
| 13 | 220 |
| 14 | 47 |
| 15 | 6 |
| 16 | 16 |
| 17 | - |
| 18 | 56 |
| 19 | 352 |
| 20 | 158 |
| 21 | 1 |
| 22 | 109 |
| 23 | 154 |
| 24 | 109 |
| 25 | 518 |
| 26 | 180 |
| 27 | 48 |
| 28 | 53 |
| 29 | 65 |
| 30 | 565 |
| 31 | 589 |
| 4 037 | |
| september | |
|---|---|
| 1 | 77 |
| 2 | - |
| 3 | 8 |
| 4 | - |
| 5 | - |
| 6 | - |
| 7 | - |
| 8 | 44 |
| 9 | - |
| 10 | - |
| 11 | 7 |
| 12 | - |
| 13 | - |
| 14 | - |
| 15 | - |
| 16 | - |
| 17 | 33 |
| 18 | 40 |
| 19 | 24 |
| 20 | 89 |
| 21 | - |
| 22 | - |
| 23 | - |
| 24 | 5 |
| 25 | - |
| 26 | - |
| 27 | - |
| 28 | - |
| 29 | 133 |
| 30 | 10 |
| - | |
| 470 | |