This national survey is ongoing. Survey website

The Nest Record Scheme is one of the longest running monitoring programmes of the BTO. Hertfordshire birders take part and we want to encourage more of you to submit nest records. First started in 1939, the scheme has collected well over 1.25 million records during its 70 years of existence. Although often receiving a lower profile than other national monitoring schemes, nest record data have been vital in diagnosing the causes of declines of some species and it was nest record data that were first used to demonstrate the shift to earlier nesting by many species linked to the recent warm springs. Nest recording is one of the simplest BTO projects to take part in, so it is accessible to everyone. It provides an ideal opportunity for you to participate in the conservation of Britain’s birds. So, whether you can monitor a single garden nestbox or are carrying out a larger study, please submit your records to BTO. The 2008 Hertfordshire Bird Report has the latest summary of nest records in Herts.