It is unusual to find wildlife in Beijing. I am surprised at the paucity of fauna here. I think most have either been eaten, or chased away by urbanization. We live in a very suburban area, but it seems like most "wildlife" we encounter here are the occasional magpies & sparrows.
This pair of mated ducks just took up residence in out compound last week. They spend their time in constant company with each other next to the koi pond, eating when the other eats, swimming when the other swims, resting when the other rests, sleeping when the other sleeps. They are more loyal to each other than many humans I know.
I hope they hang around & are able to survive the winter. Do ducks head south for the winter, anyway?