2009, COWRIE, High Definition Imagery for Surveying Seabirds and Marine Mammals: A Review of Recent Trials and Development of Protocols series https://portal.medin.org.uk/portal/start.php?tpc=015_d6b8077d12705d8f991d8e971c3fb0aa The aim of this report was to review trials if high definition imagery tehnology in the monitoring and assessment of bird numbers at offshore sites, and produce recommendations and protocols on its use alongside existing survey methodology, notably in light of its possible use in surveying round 3 wind farm development zones. With the objective to summarise the existing high definition imagery studies that have taken place, assessing what parameters were used in each and to undertake a workshop bringing together key users, developers and regulators of the industry, with a view to setting protocols and standards on the use of high definition imagery technology for seabird and mammal surveys. Information on the trials of high definition imagery technology for survey were obtained from HiDef Aerial Surveying Ltd (hereafter also HiDef), the Danish National Environment Research Institute (NERI), APEM Ltd, the University of St.Andrews, and the RSK Group plc. Information was collated in the form of reports and summaries on particular surveys, and was split into technical categories of digital video and digital still photography for further summarising. 20090901 20090101