What are the enemies of a black swan?

It depends on the species. The main predators of swans are skunks, owls, bears, foxes, and coyotes. Western species such as the Mute Swan or Trumpeter Swan have few natural predators exept humans. Foxes, coyotes and gulls commonly take juveniles and eggs but adults are relatively safe.

The Black Swan, which is native to Australia, does not have any natural predators. Its only predators are introduced species such as foxes, dogs and cats.