Yep, my big soppy gander has just turned into a monster (actually he's better today but while the goose was scouting for nest sites, he was being ultra protective). The goose is still mellow though - I've seen her being chased by both the cockerel and the drake. So if it's a gander with geese to protect, I'd say normal. If it's a goose, I'd be more puzzled...
H