Below are all months shown when black-headed gull migrated this year.
| august | |
|---|---|
| 1 | - |
| 2 | - |
| 3 | - |
| 4 | - |
| 5 | - |
| 6 | - |
| 7 | - |
| 8 | - |
| 9 | - |
| 10 | - |
| 11 | 141 |
| 12 | 390 |
| 13 | 39 |
| 14 | - |
| 15 | 40 |
| 16 | - |
| 17 | 28 |
| 18 | - |
| 19 | 23 |
| 20 | - |
| 21 | 3 |
| 22 | - |
| 23 | 247 |
| 24 | 570 |
| 25 | 59 |
| 26 | 22 |
| 27 | - |
| 28 | - |
| 29 | - |
| 30 | 24 |
| 31 | 10 |
| 1 596 | |
| september | |
|---|---|
| 1 | 65 |
| 2 | 8 |
| 3 | 79 |
| 4 | 3 |
| 5 | 5 |
| 6 | - |
| 7 | - |
| 8 | 67 |
| 9 | 6 |
| 10 | 20 |
| 11 | 3 |
| 12 | 6 |
| 13 | - |
| 14 | 4 |
| 15 | 34 |
| 16 | - |
| 17 | 16 |
| 18 | 51 |
| 19 | 182 |
| 20 | 7 |
| 21 | 24 |
| 22 | - |
| 23 | - |
| 24 | 4 |
| 25 | 45 |
| 26 | 27 |
| 27 | - |
| 28 | - |
| 29 | - |
| 30 | 7 |
| - | |
| 663 | |