3 cygnets with their parents. The adults both had tags on them. The one we speculated to be the male had "BKN" on the right leg with the other having "BKP" on the right leg. They also had metal tagging on their left leg. If anyone knows what these were for, I'd be interested to know!
The adult with the "BKN" tag was quite aggressive and protective, chasing away swamphens that were at least 3 metres away from the cygnets and minding their own business.
Photo #5 taken by Rylan.