Black Swan

Passing over the River Test on the train I sometimes see birds. At low tide its gulls. At high tide its Swans. Today was high tide, so swans. Mute swans. Except one of them was a black swan. OK so I can’t count it as towards my Hampshire list, as its an escapee. I mean they have been brought into the country by man. Normally they live in Australia and New Zealand, but apparently about 10 of them have ecaped and are now living wild. So a rare bird none the less.