 As well as birds , the reserve also harbours a varied selection of mammals . These are mostly of common species , although otters have been recorded and evidence suggests they were present for the whole of 2009 . An attempt is being made to establish the endangered water vole to the site , although success has been irregular and there were no sightings at all during 2008 or 2009 . The reserve is a haven for dragonfly and damselfly with areas being tailored to their needs — 16 species were recorded in 2008 , along with 24 species of butterfly and 220 species of moth . 
