1.An adult male duck with parasitic legs was observed.No duplicity of the genital,digestive and other internal organs could be found, so that macroscopic and radiographic observation was mainly described. 2.The parasite was attached to the left side of pelvic without arthrosis and had no relation to the daily life. From observation of the outside, it possessed normal web and scale, and it looked like two legs which had two or three toes. lnthe radiographic observation, the parasites skeleton was Y-shaped,consisting offemora partically confluent, tibiae shortend and wound tarsare. 3.This case belongs to ”Pelbamelus” after KOMAl and NAKAMURA.