 Birds (storks, pink pelicans, vultures, pigeons and doves) and reptiles (vipers, turtles and tortoises) have shown toxicity associated with bone marrow suppression, intestinal crypt cell necrosis, and distal villi sloughing.Fenbendazole is poorly absorbed from the gastrointestinal tract in most species.The in laboratory animals exceeds 10 g/kg when administered orally.