This goose and this swan are always together. At least I assume it is the same goose and same swan. I'm pretty sure there's only one goose in the whole Morges area of Lake Geneva. And whenever I see these two together and there's other swans around the goose sticks close to the same swan.
It actually seems like the goose follows the swan more than the other way around. So perhaps it is a one sided friendship. But swans can be pretty aggressive, so I'd imagine if he didn't want the goose around he'd let it be known.