small swan

Bewick swan on boardwalk pond this afternoon; must be a Slimbridge one as it took no notice of dogs, bikes and people walking. Fortunately it was next to 2 Canadas which alerted me to study its bill: the yellow patch was small and rounded, head large and neck a bit stumpy. Flew off eventually to join a group of swans flying down valley, possibly the wintering group of Whoopers.