But waiting in the wings is something formidable. I was shocked to see the leeches eating the toadlets Naturalist and all-round wildlife guru John Walters sent us to a remote pool in Dartmoor ...

The leeches in both videos belong to a species called Chtonobdella fallax. The serendipitous nature of Fahmy’s encounters ...

But leeches aren’t just useful at crime scenes. These creatures’ sanguineous appetites have also come in handy for scientists, who are hoping to use them to solve another mystery: the diversity of ...