No, I’m not swearing at the duck/goose known as the common shelduck. We saw this pair of a different variant, the ruddy shelduck, while in transit at a park in Chauvigny, near Poitiers.
The pair kept well out of the way of the large number of more common birds on the lake, including mallards and coots.
Also known as the Brahminy Duck, these birds are common in Asia. This is not the case in France, and these are probably escapees.