Like it or not, your genes run all the way back to a fishy critter called Tiktaalik that led the way to land 375 million years ago. A new documentary shows why the ancient animal deserves an honored spot in your family tree.
Anti-evolutionists have at least one thing in common with climate-change deniers and anti-vaccine nuts: they keep repeating nonsense long after it’s been debunked, and if you debunk it one more time, they pretend they can’t hear you and just keep going. Lather, rinse, repeat—it just never ends.
One of the evolution-haters’ favorites, for example, is this: if evolution really happened, with one species giving rise to another, why aren’t there any transitional fossils? Put that in your pipe and smoke it, Professor Darwin.
It would be a devastating critique if true, but it’s hogwash. Our relatively recent ancestor Lucy had both apelike and human characteristics, and paleontologists have found many more examples going back hundreds of millions of years. One of the most dramatic was announced in 2006: an ancient fishlike creature dubbed Tiktaalik. Dating back some 375 million years, it had gills, scales and a mostly fishy body. But its fins concealed bones and joints of a type never before seen in a fish, which let it crawl around on land. It was either our great-great-great (repeat many times) grandfish. Or at least, it was related.
Neil Shubin, the University of Chicago scientist who led the team that dug up Tiktaalik, went on to write a best-selling book about it, titled Your Inner Fish. That led to a three-part PBS series, and now that series is available on DVD. It’s well worth watching.
Part of the reason Your Inner Fish deserves your now fully human attention is that Shubin is such an engaging guide to what could otherwise be a dry and dusty topic, but which, thanks to his genial enthusiasm and clarity, is anything but. The search for Tiktaalik was a scientific detective story, and that’s just how he lays it out. Fish, he reminds us, were the first animals with backbones, skulls and overall bony skeletons. They swam the world’s oceans 400 million years ago—and then, 40 million years later, the first amphibians were up on land.
Something must have happened in that 40-million year gap to make the transition to land possible, and armed with the knowledge of the timeframe and the places in the world where sedimentary rock of the right age was accessible, Shubin and his team ended up on Ellesmere Island, in spectacularly remote and austere landscape not far from the northern tip of Greenland. It took years of painstaking searching, requiring return visits during the brief Arctic summer year after year for a full decade until, in the second week of July, 2004, they found what they were looking for.
Written By: Michael D. Lemonick
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