Andrew Bloomfield / April 2020 – vol. 113, issue 4, pp 238–239 In 2018, I became involved in surveying and monitoring my local Grey Heron Ardea cinerea population, particularly early in the season as the birds returned to their colony after the winter. My study site was Decoy Wood at Holkham NNR, Norfolk. In late March and early April, when males perform their ‘advertising displays’ from platforms that ultimately become their nest sites, I ... This article is only available to registered users.To read more, please log in or purchase a subscription.