The giant red leech they found was 50cm long, and is so big that it doesn't feed on blood like most leeches. It actually has a wide mouth and just slurps its prey down - including an earthworm that is longer than the leech! Little is known about the leech species because it hasn't been studied yet. It doesn't even have a Latin name.
I have a feeling you won't be able to resist clicking the link to watch the video, either. It's even complete with weird, horror music to set the scene.