The larvae of Baylisascaris transfuga (Rudolphi, 1819) were able to penetrate the liver, lungs, carcass and brain of infected chickens, but a great number of larvae accumulated in the liver. No clinical signs were seen. Birds may serve as paratenic hosts of the parasite, but B. transfuga seems not to be a possible agent of avian cerebrospinal nematodosis.