Leeches on Skin | Time-Lapse | Earth Unplugged | Bitten by Leeches! | 4K

Warning, this film contains images of blood. Humans have long had an unusual mutualistic relationship with leeches. Maddie puts herself forward to experience a leech suck for herself and we filmed this time-lapse!

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Leeches Sucks my Blood! Time-Lapse | Bitten by Leeches! | 4K Living Cthulhu tattoo | 4K
The medicinal leech (Hirudo medicinalis) is the best known representative of the leeches or the "leeches". It has been used to treat various diseases for centuries. Like most species of leeches, it occurs in fresh water. Its natural range is Europe, North Africa and Asia Minor. It is easy to confuse it with the Mediterranean medicinal leech (Hirudo verbana, also known as the Hungarian leech). Even more often, the black-brown horse leeches (Haemopis sanguisuga), which are greenish on the underside, are mistaken for medicinal leeches: they reach a similar size. Outside the water, the medical leech moves with the help of two suction cups on the ends of the body. Adult animals are stretched out up to 15 cm long, and a mark on the back can be seen in bright light and if blood is present in the leech. Hirudo medicinalis has a brownish to olive-green color, six mostly reddish longitudinal stripes on the back and black spots on the belly - in contrast to the Hungarian leech, whose belly is a solid green. Leeches are long-lived: they do not become sexually mature until they are three years old and are over 30 years old.

Although leeches are hermaphrodites, they require a sexual partner in order to reproduce. After mating, up to 20 eggs are laid outside the water and spun into cocoons. After hatching, the young leeches feed on small invertebrates that they eat or suckle. They later suckle on frogs and fish, and finally as adults on mammals including humans.

With the help of tactile organs on the surface of the skin, leeches become aware of potential prey. You can still perceive the movements in the water from a distance of several meters, for example if there is a larger mammal in the water. With snaking movements of their muscular bodies, they swim quickly and purposefully towards the source of the stimulus. The leech sucks on the skin and "saws" it with the help of its three jaws, which are covered with sharp calcite teeth. Even thick cowhide can be penetrated in a few seconds. The salivary glands that open between the jaws secrete, among other things, the anticoagulant substance hirudin. A leech can then suck up to five times its body weight in blood in about 30 to 60 minutes.

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