Below are all months shown when black-headed gull migrated this year.
| august | |
|---|---|
| 1 | 270 |
| 2 | 191 |
| 3 | 176 |
| 4 | 392 |
| 5 | 130 |
| 6 | 88 |
| 7 | 91 |
| 8 | 73 |
| 9 | 29 |
| 10 | 17 |
| 11 | 5 |
| 12 | - |
| 13 | - |
| 14 | 2 |
| 15 | 82 |
| 16 | 2 |
| 17 | - |
| 18 | 8 |
| 19 | 69 |
| 20 | 227 |
| 21 | 66 |
| 22 | 55 |
| 23 | 168 |
| 24 | 66 |
| 25 | 75 |
| 26 | - |
| 27 | 17 |
| 28 | 3 |
| 29 | 1 |
| 30 | 2 |
| 31 | 3 |
| 2 308 | |
| september | |
|---|---|
| 1 | 6 |
| 2 | - |
| 3 | 12 |
| 4 | - |
| 5 | 2 |
| 6 | 53 |
| 7 | 25 |
| 8 | 22 |
| 9 | 47 |
| 10 | 78 |
| 11 | 252 |
| 12 | 20 |
| 13 | 87 |
| 14 | 230 |
| 15 | 73 |
| 16 | 104 |
| 17 | 100 |
| 18 | 58 |
| 19 | - |
| 20 | - |
| 21 | - |
| 22 | - |
| 23 | - |
| 24 | - |
| 25 | - |
| 26 | 20 |
| 27 | 22 |
| 28 | 3 |
| 29 | 10 |
| 30 | 15 |
| - | |
| 1 239 | |