More than 200 swans succumbed during the spring of 1964. Examination of 45 birds established that lead poisoning was responsible. Characteristic findings include: emaciation, enteritis, green diarrhea, a distended gall bladder, stained gizzard lining and liver, and lead pellets in the gizzard. The number of pellets recovered from affected birds ranged from 0-201 and averaged 50. To confirm a diagnosis of lead poisoning, necropsy findings and chemical analysis are essential.