This national survey is ongoing.


2021 is the final year of the national census of urban nesting Gulls, which is part of the 4th UK seabird census (called the Seabird Count) which has been running since 2015. Full details of the Seabird Count can be found at Seabird Censuses | JNCC - Adviser to Government on Nature Conservation and  It is known that these Gulls (Herring and Lesser Black-backed) nest on buildings in several areas of the county including Watford, Hemel Hempstead, St Albans and Borehamwood, but there has been expansion into other areas over recent years including the Lea Valley.

Coverage for this survey is now complete