Your Inner Fish

FINDING YOUR INNER FISH

Typical summers of my adult life are spent in snow and sleet, cracking rocks on cliffs well north of the Arctic Circle. Most of the time I freeze, get blisters, and find absolutely nothing. But if I have any luck, I find ancient fish bones. That may not sound like buried treasure to most people, but to me it is more valuable than gold.

Ancient fish bones can be a path to knowledge about who we are and how we got that way. We learn about our own bodies in seemingly bizarre places, ranging from the fossils of worms and fish recovered from rocks from around the world to the DNA in virtually every animal alive on earth today. But that does not explain my confidence about why skeletal remains from the past-and the remains of fish, no less-offer clues about the fundamental structure of our bodies.

How can we visualize events that happened millions and, in many cases, billions of years ago? Unfortunately, there were no eyewitnesses; none of us was around. In fact, nothing that talks or has a mouth or even a head was around for most of this time. Even worse, the animals that existed back then have been dead and buried for so long their bodies are only rarely preserved. If you consider that over 99 percent of all species that ever lived are now extinct, that only a very small fraction are preserved as fossils, and that an even smaller fraction still are ever found, then any attempt to see our past seems doomed from the start.

DIGGING FOSSILS-SEEING OURSELVES

I first saw one of our inner fish on a snowy July afternoon while studying 375-million-year-old rocks on Ellesmere Island, at a latitude about 80 degrees north. My colleagues and I had traveled up to this desolate part of the world to try to discover one of the key stages in the shift from fish to land-living animals. Sticking out of the rocks was the snout of a fish. And not just any fish: a fish with a flat head. Once we saw the flat head we knew we were onto something. If more of

NEIL SHUBIN is provost of The Field Museum as well as a professor of anatomy at the University of Chicago, where he also serves as an associate dean. Educated at Columbia, Harvard, and the University of California at Berkeley, he lives in Chicago.

"A delightful introduction to our skeletal structure, viscera and other vital parts-and evidence that learning the secrets of the human body need not unhinge you. . . . [Shubin] is a warm and disarming guide. . . . Future researchers, aware that the ingredients of our evolutionary precursors are part of the human recipe, may well find new ways to prevent the wear and tear on our fish-begotten bodies. And who knows? Maybe one or two of them will have had their first taste of the marvels of human evolution in Neil Shubin's anatomy class." -Los Angeles Times

"With infectious enthusiasm, unfailing clarity, and laugh-out-loud humor, Neil Shubin has created a book on paleontology, genetics, genomics, and anatomy that is almost impossible to put down. In telling the story of why we are who we are, Shubin does more than show us our inner fish; he awakens and excites the inner scientist in us all." -Pauline Chen, author of Final Exam

"Your Inner Fish is my favorite sort of book-an intelligent, exhilarating, and compelling scientific adventure story, one which will change forever how you understand what it means to be human. . . . Shubin is not only a distinguished scientist, but a wonderfully lucid and elegant writer; he is an irrepressibly enthusiastic teacher whose humor and intelligence and spellbinding narrative make this book an absolute delight. Your Inner Fish is not only a great read; it marks the debut of a science writer of the first rank." -Oliver Sacks, Amazon.com

"The antievolution crowd is always asking where the missing links in the descent of man are. Well, paleontologist Shubin actually discovered one. . . . A crackerjack comparative anatomist, he uses his find to launch a voyage of discovery about the evolutionary evidence we can readily see at hand. . . . Shubin relays all this exciting evidence and reasoning so clearly that no general-interest library should be without this book." -Booklist (starred review)

"A skillful writer, paleontologist