Carl then set about prepping the pig’s blood which would be placed in a synthetic tube to replicate human skin.
“We used to use natural skin but it’s a bit wibbly wobbly so the collagen stuff is really good,” Carl said.
“This is like a membrane they can feed through.”
Carl went on to explain leeches would start by feeding off frogs before moving onto small mammals like water voles in the wild.
BBC viewers then saw a variety of leeches which can be found in the wild and can attach to prey for 30-60 minutes.
As soon as the blood was placed into the tank, the leeches began to attach and feed from the membrane.
Carl explained the medicinal uses for the leeches, listing: “When using them medically, they are trying to keep the blood flowing.
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