Below are all months shown when black-headed gull migrated this year.
| august | |
|---|---|
| 1 | - |
| 2 | - |
| 3 | - |
| 4 | - |
| 5 | - |
| 6 | - |
| 7 | - |
| 8 | - |
| 9 | - |
| 10 | - |
| 11 | 51 |
| 12 | 234 |
| 13 | 4 |
| 14 | 80 |
| 15 | 109 |
| 16 | 103 |
| 17 | 685 |
| 18 | 196 |
| 19 | 395 |
| 20 | 202 |
| 21 | 502 |
| 22 | 182 |
| 23 | 31 |
| 24 | 218 |
| 25 | 210 |
| 26 | 328 |
| 27 | 116 |
| 28 | 35 |
| 29 | 182 |
| 30 | 201 |
| 31 | 33 |
| 4 097 | |
| september | |
|---|---|
| 1 | 159 |
| 2 | 7 |
| 3 | - |
| 4 | 2 |
| 5 | - |
| 6 | - |
| 7 | - |
| 8 | - |
| 9 | 5 |
| 10 | - |
| 11 | 180 |
| 12 | 470 |
| 13 | 100 |
| 14 | 87 |
| 15 | 90 |
| 16 | 46 |
| 17 | 89 |
| 18 | 12 |
| 19 | 5 |
| 20 | 14 |
| 21 | - |
| 22 | - |
| 23 | 2 |
| 24 | 12 |
| 25 | 6 |
| 26 | 23 |
| 27 | 9 |
| 28 | 5 |
| 29 | 16 |
| 30 | - |
| - | |
| 1 339 | |