 Large numbers of bird species are resident or passage migrants here , including many ducks , geese and waders . The wide range of species is mainly due to Brandon Marsh being one of the few extensive areas of water in the area ( accounting for such local rarities as osprey and whooper swan ) together with the existence of habitats such as reedbed and woodland in close proximity . 148 different species were recorded during 2009 alone — including one new record , a vagrant woodchat shrike which was the first recorded in Warwickshire — and 66 species bred at the site . These figures have been assisted by a nest box scheme ; in 2008 there were 49 occupied nest boxes which produced 270 fledged young , and by 2009 these numbers had increased to 65 and 352 respectively , including two owl species , barn owl and tawny owl . 
