Tibetannet

With black feathers and fiery-red mouths, blanck swans sometimes crane their necks, flap their wings, and gracefully dance “ballet” on the surface of water at Norbulingka Zoo, in Lhasa, capital of southwest China’s Tibet Autonomous Region. [Photo/ VTIBET.com]

With black feathers and fiery-red mouths, blanck swans sometimes crane their necks, flap their wings, and gracefully dance “ballet” on the surface of water at Norbulingka Zoo, in Lhasa, capital of southwest China’s Tibet Autonomous Region. [Photo/ VTIBET.com]

With black feathers and fiery-red mouths, blanck swans sometimes crane their necks, flap their wings, and gracefully dance “ballet” on the surface of water at Norbulingka Zoo, in Lhasa, capital of southwest China’s Tibet Autonomous Region. [Photo/ VTIBET.com]

With black feathers and fiery-red mouths, blanck swans sometimes crane their necks, flap their wings, and gracefully dance “ballet” on the surface of water at Norbulingka Zoo, in Lhasa, capital of southwest China’s Tibet Autonomous Region. [Photo/ VTIBET.com]