Below are all months shown when black-headed gull migrated this year.
| august | |
|---|---|
| 1 | - |
| 2 | - |
| 3 | - |
| 4 | - |
| 5 | - |
| 6 | - |
| 7 | - |
| 8 | - |
| 9 | - |
| 10 | - |
| 11 | 316 |
| 12 | 97 |
| 13 | - |
| 14 | 40 |
| 15 | 28 |
| 16 | - |
| 17 | 13 |
| 18 | 178 |
| 19 | 629 |
| 20 | 103 |
| 21 | 336 |
| 22 | 334 |
| 23 | 160 |
| 24 | 564 |
| 25 | 738 |
| 26 | 363 |
| 27 | 2 |
| 28 | 5 |
| 29 | 5 |
| 30 | 7 |
| 31 | - |
| 3 918 | |
| september | |
|---|---|
| 1 | - |
| 2 | 28 |
| 3 | 31 |
| 4 | - |
| 5 | 14 |
| 6 | 42 |
| 7 | 48 |
| 8 | 6 |
| 9 | - |
| 10 | - |
| 11 | 5 |
| 12 | - |
| 13 | - |
| 14 | 15 |
| 15 | 81 |
| 16 | 57 |
| 17 | 16 |
| 18 | 9 |
| 19 | - |
| 20 | 2 |
| 21 | 9 |
| 22 | - |
| 23 | 182 |
| 24 | 74 |
| 25 | 90 |
| 26 | 8 |
| 27 | 13 |
| 28 | 57 |
| 29 | 86 |
| 30 | 29 |
| - | |
| 902 | |