Black Swan (Cygnus atratus, 黑天鹅).
Kept in the zoological water garden by the Hunan Art Museum. There four adults, including one nesting and four young cygnets.
When I was young on Vancouver Island, a black swan appeared at Esquimalt Lagoon: I heard at the time it was an improbable traveller from Australia but I suppose it could have escaped from captivity somewhere closer: in any case, after it began to attract attention, some people (assumed to be teenagers, of course) came at night and killed it with stones.