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Dillon Press Inc, Minneapolis - ISBN:0875184081, © 1989. hardcover, 7½" x 8¾, with illustrated board covers. Ours is an ex-library copy in transparent protective covering, with usual stamps, stickers, barcode etc. Book in VERY GOOD condition. Leeches are fascinating animals, simple in design yet capable of complex behaviour. They can walk like worms using both front and rear suckers, or stetch themselves into long, graceful ribbons and swim like miniature sea serpents waving slowly up and down. They sense motion, pain, light, and odor, hunt their prey, and reproduce. All of these activities are controlled by a very simple nervous system, spread the length of their body, which is not much more than a muscular tube. Leech saliva may have important medical uses.