Distribution Maps
These maps show all of the tetrads in which Black-headed Gull was recorded and the maximum number of individuals recorded in each tetrad (abundance).
These maps show the tetrads in which Black-headed Gull was recorded in Summer and Winter respectively.
Summary statistics
| Statistic | Breeding season | Winter | Total |
|---|---|---|---|
| No. of tetrads | 66 | 134 | 144 |
| No. of visits | 90 | 220 | 310 |
| Highest count | 280 | 550 |
Changes from the Bird Atlas 2007-11
Simple catchment maps showing change in distribution from the Bird Atlas 2007-11:
- -1 (species lost to the Tetrad), recorded in 2007-11 but not in 2016-20 data
- 0 (species remains in the Tetrad), recorded in both 2007-11 and 2016-20 data
- +1 (species gained in the Tetrad), recorded in 2016-20 but not in 2007-11 data
Map data (c) OpenStreetMap contributors, (c) Environment Agency