The Giant Red Leech… have grown so big that they no longer simply suck blood but now actively hunt giant blue worms and suck them down like spaghetti. The new footage shows the leech detecting a worm’s trail and following the scent like a sniffer dog. When it encounters its prey it quickly latches on and moves its lips up and down the iridescent blue body. “It was either searching for an end to grab, or was working out whether it was too big to eat” said documentary director Paul Williams. “When it found an end it started to suck. It was incredible.”

I’m not sure what freaks me out the most… the sniffing, the swiftness or the slurping. Witness the horror for yourself:

http://www.bbc.co.uk/emp/embed/smpEmbed.html?playlist=http%3A%2F%2Fwww.bbc.co.uk%2Fiplayer%2Fplaylist%2Fp027f9q0&title=Wonders%20of%20the%20Monsoon%3A%20Strange%20Castaways%3A%20Monster%20leech%20swallows%20giant%20worm&product=iplayer