Only black swans have died in succession! Just now, Yuanmingyuan issued a situation statement.
On such-and-such date, Yuanmingyuan released "A Statement on the Recent Situation of Black Swans":
Recently, a brooding black swan at the Yuanmingyuan's Quyuan Fenghe and Fenglin Zhou locations has died successively, drawing widespread concern from visitors. Following the incident, the park authorities immediately sent the deceased swan to a professional institution for a cause-of-death examination. The results indicated that the swan's injuries were all animal bites, leading to death due to the bites, thus ruling out the possibility of human harm.