Four newly born Black Swans (Cygnus atratus) swim near their mother in Santa Fe zoo in Medellin October 29, 2012. The swans were born at the zoo 12 days ago. REUTERS/Albeiro Lopera (COLOMBIA – Tags: ANIMALS SOCIETY)

Four newly born Black Swans (Cygnus atratus) swim near their mother in Santa Fe zoo in Medellin October 29, 2012. The swans were born at the zoo 12 days ago. REUTERS/Albeiro Lopera (COLOMBIA – Tags: ANIMALS SOCIETY)