It's a large, deadly, and highly aggressive pit viper. "Glad to be out of the woods. Are we there yet?" Yup. This is classic habitat for the giant Amazonian leech. These savannah swamps fill with ...

Step inside the world of farmers who specialize in the cultivation of leeches, offering a rare and fascinating look into the largest leech farm. This factory tour showcases the meticulous techniques ...

The leech multiplies its body mass by six or seven ... In this short film Dr Michael Mosley investigates hookworms - large parasites which invade our immune system. He meets a sufferer of Crohn ...