Below are all months shown when black-headed gull migrated this year.
| august | |
|---|---|
| 1 | - |
| 2 | - |
| 3 | - |
| 4 | - |
| 5 | - |
| 6 | - |
| 7 | - |
| 8 | - |
| 9 | - |
| 10 | - |
| 11 | 27 |
| 12 | 102 |
| 13 | 47 |
| 14 | 48 |
| 15 | 63 |
| 16 | 125 |
| 17 | 228 |
| 18 | 2 |
| 19 | 15 |
| 20 | 37 |
| 21 | 48 |
| 22 | 509 |
| 23 | 3 018 |
| 24 | 229 |
| 25 | 45 |
| 26 | - |
| 27 | 8 |
| 28 | 125 |
| 29 | 234 |
| 30 | 173 |
| 31 | 220 |
| 5 303 | |
| september | |
|---|---|
| 1 | 28 |
| 2 | 115 |
| 3 | 77 |
| 4 | 321 |
| 5 | 152 |
| 6 | 61 |
| 7 | 106 |
| 8 | 88 |
| 9 | 22 |
| 10 | - |
| 11 | 172 |
| 12 | 189 |
| 13 | 247 |
| 14 | 116 |
| 15 | 78 |
| 16 | 4 |
| 17 | 28 |
| 18 | 106 |
| 19 | - |
| 20 | 59 |
| 21 | - |
| 22 | 30 |
| 23 | 48 |
| 24 | - |
| 25 | 218 |
| 26 | 36 |
| 27 | 189 |
| 28 | 82 |
| 29 | 14 |
| 30 | 9 |
| - | |
| 2 595 | |