 Myrtle's removal to the Zoo was preceded by the removal of two swans from the park in 1991.While visibly ill in June 1997, Myrtle was again removed from the park to the Zoo without incident, and she was subsequently treated for lead poisoning and a fungal infection in her lungs.While the lake was being treated to remove lead in the sediment, Myrtle was moved in November 1997 to a temporary refuge at E and T Waterfowl, a ranch north of Sebastopol.