Leeches are used best for catching large trout while flyfishing. These parasites live on reptiles, snails or cold-blooded fish; some live off plants and dead animals. They don't have eyes but have a high sense of smell and touch. Their highly developed muscular system and multi-segmented body allows them to change their body form from short and fat to thin and elongated. Both ends of the leech have strong suction cups to hold on to the host or bottom structures. They can reach anywhere from 1"- 6" in length. Leeches have a wide range of color, anywhere from light crème to black, brown, gray, or olive, with lateral stripes. They may have mottled spots or markings.

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