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71 of 72 people found the following review helpful:
5.0 out of 5 stars
This book will alter how you look at the world, December 3, 2000
This is one of those rare books that can totally alter how you look at the world. Read it and you begin seeing parasites in every skin blemish you have. See a cat catch a mouse and all you can do is think about all the parasites its about the ingest. You find youself wanting to visit the parasite museum in Maryland to see all the horrible creatures you've been reading about. You begin thinking that Zimmer's right and that parasites have driven the evolution of the world. You begin wodering if Stephen King has read it and if so what novel he's writing. You begin wondering if there's thousands of little cysts in your brain and that your life goal of going on safari in Africa may need revaluated. You imagine what its like to extract a guinea worm from your leg. You question whether or not you will ever eat crab again. You wonder whether the reason you've been so hungry of late is because there's a sixty foot long tapeworm inside your intestines. It's a stunning book and an important one. Zimmer found something obvious that's been overlooked in biology and if he's right will change the way we view life. Survival of the individual will be changed to survival of the creature living inside the indiviual. For example, there is a parasite that gets inside a snail, takes it over, forces it climb a blade of grass and wait for a grazing cow to wander by and eat it. The cow is where the parasite wants to end up. The snail is just a vessel to reach the cow. The young of the parasite end up in cow pies which the snail eats and the cycle begins again. The complex world of flukes and tapeworms, of enslaved crabs and suicidal snails, of sleeping sickness and malaria, is like a car wreck: you want to turn away but you can't, you're compelled to look fearful of what you might see. As you explore the book you learn that these creatures are much more than revolting. I can't say you'll ever view them with sympathy, you can view them with respect -- and hopefully at a safe distance.
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34 of 34 people found the following review helpful:
5.0 out of 5 stars
Hippity hop! Where to stop?, November 14, 2004
Once considered a "degenerate" form of life, parasites are being seen as important indicators of how evolution has progressed over 4 billion years. Zimmer credits them with being the driving force for biological diversity. He substantiates this claim with a sweeping, evocative survey of what is known today about parasites. That, he regretfully concedes, is little enough. What is known is that many early conceptions about parasites needed to be thrown aside as more information about this highly adaptable and widely variable range of organisms emerges.
While we may recoil at the term "parasite", Zimmer identifies but one villain in this book. Ray Lankester, a devoted Edwardian-era evolutionist, postulated that parasites were a "regressive" form of organism. He thought they shed evolutionary advantages as they simplified their bodies through their life cycles. Lankester thus set the tone for generations - biologists avoided studying parasites as offering no additional information revealing evolution's processes. Zimmer explains that since parasites are predators, it was thought they ought to follow the patterns of other predators - stalking prey like lions, or following scent gradients like sharks.
Instead, as more about them came to light, it was revealed how adaptive parasites are. Some, in fact, have developed the talent of making "prey" come to them. One fluke invades a snail early in its career. In an intermediate, but distinctive form, it then moves to an ant. Residing in the ant's brain, at some point it directs the ant to climb a grass stalk. There it waits for the grass, along with the ant and itself, to be eaten by a cow. The fluke cruises through the cow's stomach before taking up residence in the liver as adults, yet another body form. When the eggs are produced, they return to the intestinal tract to be later deposited on the ground, awaited by the snails. Looking at each phase, residing in a different host, you would be inclined to see it as a separate species.
This note is but one of the endless chorus of parasite adaptations Zimmer relates in this excellent book. He joins the refrain of older scientists lamenting the lack of upcoming researchers needed in parasite studies. Unlike the animals we see around us, most parasites have astonishingly varied body forms as they go through the phases of their life cycles. For years, this catalog of body plans was thought to display different species. Only recently has it been demonstrated that these creatures changed shape and function dramatically as they changed living environments. Identifying each stage, the invader's function there, the impact on the host and other elements requires long, patient and dedicated work.
Those of us in the urban world think we can keep parasites at a distance, flooding our farms and wetlands with chemicals to fend them off. This is false confidence, Zimmer reminds us. Parasites are the most adaptable forms of life on the planet. They are as likely to promote change as respond to it. Zimmer cites Robin Dunbar's thesis that grooming for parasites ultimately allowed humans to develop speech and language. He explains how our immune systems and parasites enter a modus vivendi that allows the parasite and host alike to survive. Recognising how that process evolved could lead to better coexistence through "taming" the invaders.
Coexistence with these minute creatures turns out to have many implications. It's now clear that the development of agriculture made human society vulnerable to invaders unknown on the savannah. Human bodies became less robust and mortality rates rose. How far back in time have they had influences on us and what are those? Zimmer suggests that some monkeys have developed "manners" in resource or mate competition. They scream and cavort, but don't scratch or bite rivals for fear of bloodworm infection. Others use particular leaves to clear digestive tracts of infestations. We hear of researchers seeking "genes for" schizophrenia, homosexuality, even "gods". Zimmer thinks we're looking in the wrong place. Instead, he urges, we should identify the "flukes for" these and other aspects of human behaviour and form. [stephen a. haines - Ottawa, Canada]
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22 of 22 people found the following review helpful:
5.0 out of 5 stars
Nature red in tooth and claw? Think again., October 22, 2000
Luered by the fascinating account of guinea worms and toxoplasma mentioned in Salon's interview with Mr. Zimmer, I have picked this book - and I was not disappointed. The first half of the book focusses on myriad examples of parasitic lives - which is written so beautifully, it is worth the price of the hardcover by itself. Who would have thought a blood fluke can be such a romantic? The author also introduces the people who studies the undeservingly esoteric subjects, but the main characters in the book remains to be the parasites, which leads very interesting lives. The second half becomes more theoretical, where he discusses the ecological and evolutionary root and consequences of parasitic organisms. Because the book is written for non-biologists, he does go over some facts that are obvious to anyone who has studied biology, and I found that a little tiresome (but I understand that this is necessary for many). However, if you have read Richard Dawkin's famous book "The Selfish Gene", this book brings some fresh insight into the evolution of "replicators" and the development of sex and immune system (if you have not read it, I suggest you read that as well). All in all, it is a concise, engaging book which makes for an excellent weekend read. This book will also cram you with so many interesting stories that by the end of the read you will be dying to share the fascinating stories of parasites with your friends.
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