Below are all months shown when black-headed gull migrated this year.
| august | |
|---|---|
| 1 | - |
| 2 | - |
| 3 | - |
| 4 | - |
| 5 | - |
| 6 | - |
| 7 | - |
| 8 | - |
| 9 | - |
| 10 | - |
| 11 | 699 |
| 12 | 852 |
| 13 | 602 |
| 14 | 480 |
| 15 | 559 |
| 16 | 385 |
| 17 | 79 |
| 18 | 81 |
| 19 | 491 |
| 20 | 10 |
| 21 | - |
| 22 | 7 |
| 23 | 50 |
| 24 | 1 |
| 25 | 123 |
| 26 | 123 |
| 27 | 145 |
| 28 | 38 |
| 29 | 30 |
| 30 | - |
| 31 | 3 |
| 4 758 | |
| september | |
|---|---|
| 1 | 36 |
| 2 | - |
| 3 | - |
| 4 | 5 |
| 5 | - |
| 6 | - |
| 7 | 76 |
| 8 | 5 |
| 9 | 33 |
| 10 | 67 |
| 11 | 39 |
| 12 | - |
| 13 | 10 |
| 14 | - |
| 15 | 63 |
| 16 | 199 |
| 17 | 122 |
| 18 | - |
| 19 | - |
| 20 | - |
| 21 | - |
| 22 | - |
| 23 | - |
| 24 | 13 |
| 25 | - |
| 26 | - |
| 27 | 10 |
| 28 | - |
| 29 | - |
| 30 | - |
| - | |
| 678 | |