AIM: To explore the distribution and development of Paragonimus westermani and Pagumogonimus skrjabini in fowls and frogs in addition to the invasiveness of the juveniles recovered from the above animals to cats or dogs. METHODS: Chickens, ducks, quails and parrots were infected orally each with 30 - 200 metacercariae of Paragonimus westermani and Pagumogonimus skrjabini, respectively. Dogs or cats were infected with juveniles obtained from the above animals. RESULTS: Juveniles were obtained from body cavities, livers, lungs and muscles of fowls and frogs 60 days after infection. Most of the juveniles were detected from the muscles but their development retarded. In 60 frogs infected with metacercariae of Paragonimus westermani, no worm was found. Infection rate of frogs infected with Pagumogonimus skrjabini was1.7% - 40.0%. After host transfer, juveniles developed well and matured in the thoracic cavities or lung worm cysts of dogs or cats, but some prematured worms were also detected. CONCLUSION: Attention should be given to the role of fowls or frogs in the transmission of human paragonimiasis in endemic area.