The Nightjars at Llyn Bodgynydd were showing really well tonight in really good light,although it was cold up there. At least four birds seen. One seen feeding over the small lake wing flapping etc.Most amazing bit was when a Tawny Owl flew in followed by two Nightjars. The owl landed on a post and the Nightjars landed on posts next to it. I watched for a full ten minutes whilst one Nightjar repeatedly attacked the Tawny from the top of a bush. An amazing observation I am likely to not encounter agian.