In 2004 and 2005 thousands of Black-necked Swans in the Carlos Anwandter Nature Sanctuary in Chile died or migrated away following major contamination by the newly opened Valdivia Pulp Mill located near the city of Mariquina and Cruces River which feeds the wetlands.
In 2004 and 2005 thousands of Black-necked Swans in the Carlos Anwandter Nature Sanctuary in Chile died or migrated away for no clear reason-The Valdivia pulp mill, located upriver, was blamed. The mill is located near the city of Mariquina and Cruces River which feeds the wetlands.