Crepuscular time of year

Went to Cresswell Pond this evening from 5:45 to 6:45 to try once again and see a Bittern. I can tell it is going to be the new Water Rail.
On the way to the hide I saw a merlin on the telephone wire near the road and a Barn Owl was hunting around the smaller pond.
I didn't see the Bittern, (as usaual) but did see a flock of 500+ Barnacle Geese fly over and around the pond as I was leaving.
On my way home I saw 400+ Pink Footed Geese land in the crane field next to Alcan.