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Phylogeny of Leeches (Hirudinea) Based on Mitochondrial CytochromecOxidase Subunit I.
The authors state that Piscicola geometra (L.), Piscicola respirans Troschel, 1850, and Caspiobdella fadejewi (Epshtein, 1968) find their hosts (fishes) by reacting to their shadow.
A study of the behaviour, biology, adaptation to habitat, feeding habits and importance to medicine, reveals leeches to be fascinating and extraordinary animals.
This page states that leeches are among the most highly specialized of the annelids. They are predominantly freshwater organisms, although there are marine and terrestrial forms. Leeches are highly specialized predators that feed on blood.