The Aleutian goose normally nests in Alaska but this pair stayed here to raise their family because one of them has a broken wing. Maybe it can't fly but it sure has raised a nice family!
The Aleutian geese (a sub-species of the Canada goose) are on their annual winter/spring trek from the Central Valley via the Pacific flyway -- to their nesting grounds in the Aleutian islands in Alaska. They stop for only a few months in Northern California and Southern Oregon to feed on grasses rich with protein.
Besides its smaller size than the Canada goose, another way to recognize this cackling goose is by a white collar ring at the base of its long black neck.