Having not seen either of the 2 regular Bitterns the previous 2 nights i was beginning to wonder whether they had migrated even though the weather had not been ideal. However just before dark a Bittern walked out into an area of cut reeds and displayed like mad. No other Bittern was visible although an Otter did pass by shortly after wards. It settled down on the waters edge and was still visible at 7.30pm silhouetted against the water. Was it one of the 2 regulars (they always roosted in the reed-heads) or was it a passing migrant?