Not the best picture, but a lone Canada Goose.
The Geese where gathering at the west end of the lake. There was Mallards with them.
The Canada Goose (Branta canadensis) is a goose with a black head and neck, white patches on the face, and a brownish-gray body. Native to arctic and temperate regions of North America, it also occasionally migrates to northern Europe, and has been introduced to Britain, New Zealand, and other temperate regions.