Andy Adcock
Worst person on Birdforum
My twenty five year old notes state that they became active at dusk but I have hazy memories of seeing them over the marsh in what was not far off total darkness!We were there in 2016 so our info is old (there is a report from me somewhere here). Seeing Marsh Owl was easy, there was a local guy who became our "guide" without giving us any choice (but he did not pressure for any money) and he pushed us in the right direction. The owls were flying with plenty of light still.