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Of the 650 species of leech listed, Hirudo medicinalis is one of the most extensively studied. This annelid from the subclass Hirudinea has 2 suckers, one housing the mouth and its 3 jaws. It lives mainly in the stagnant waters of marshes and ponds. When it comes to reproduction, the animal is a hermaphrodite. Inseminated leeches lay their eggs during the spring and summer months, outside the water, with cocoons containing as many as thirty young.
First off, there are lotâs of leek varieties out there. There seem to be two basic classifications of leeks, tall and short. Not all the tall leeks are skinny and not all the short leeks are fat, but it seems to tend that way as if the plant had only so much to grow and was guided either out or up.