The Canada Goose is a wild goose which is native to arctic and temperate regions of North America. The species is frequently found on golf courses, parking lots and urban parks. In many areas, non-migratory Canada Geese are now regarded as pests by humans.
Geese have a tendency to attack humans when they feel themselves or their goslings to be threatened. First the geese will stand erect, spread their wings and produce a hissing sound. Next, the geese will charge. They may then bite or attack with their wings.
(via Everlasting Blort)