I walked along the Fauna footpath last night, shortly after dark. There was a lot of noise coming from School Pond – birds calling and splashing about. Identified the laughing quack of the mallard and, listening to the audio on the RSPB website, the other sounds were probably also mallards. Hadn’t realised that these are amber list birds!
https://www.rspb.org.uk/discoverandenjoynature/discoverandlearn/birdguide/name/m/mallard/index.aspx