I watched a National Geographic documentary tonight and the journalist & a researcher waded into an Amazonian swamp to attract some giant Amazon leeches (who normally feed on caimans and anacondas).
On the show they mentioned a length of up to 16 inches. One such leech attached itself to the journalist's leg and started sucking his blood. He went ashore and the thing kinda contracted itself because it was out of the water. Well, it was as thick as a baseball in that state.
They showed how to gently remove it but the journalist found out that that kind of leech injects a proboscis like a flexible seringe that is about 3 inches long. They slowly drew the proboscis out and when it finally exited, the guy started really bleeding for a little while because of the anticoagulants secreted by the leech. The ones secreted by this particular leech are being studied in particular because they can actually dissolve blood clots and could therefore be used to treat stroke victims.
Pics:
http://www.britannica.com/EBch...tractable-proboscis-is
http://invertebrates.si.edu/Fe...ages/stories/leech.jpg
http://deeperwants.com/ratboys_anvil_2/giantleech.jpg
The giant Amazon leech can grow as large as the forearm of an adult human being.
On the show they mentioned a length of up to 16 inches. One such leech attached itself to the journalist's leg and started sucking his blood. He went ashore and the thing kinda contracted itself because it was out of the water. Well, it was as thick as a baseball in that state.
They showed how to gently remove it but the journalist found out that that kind of leech injects a proboscis like a flexible seringe that is about 3 inches long. They slowly drew the proboscis out and when it finally exited, the guy started really bleeding for a little while because of the anticoagulants secreted by the leech. The ones secreted by this particular leech are being studied in particular because they can actually dissolve blood clots and could therefore be used to treat stroke victims.
Pics:
http://www.britannica.com/EBch...tractable-proboscis-is
http://invertebrates.si.edu/Fe...ages/stories/leech.jpg
http://deeperwants.com/ratboys_anvil_2/giantleech.jpg