Dinosaurs Of A Feather

Two new fossils show clear signs of plumage, confirming that birds probably did evolve from dinosaurs. Stay tuned for Jurassic Henhouse

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Michael Crichton is probably heaving a huge sigh of relief. The author of Jurassic Park and The Lost World is known as a stickler for scientific accuracy in his books and the films made from them. But honestly, how much terror could readers and filmgoers have worked up at the idea of people trapped on a tropical island and chased around by a pack of large chickens? That sort of thing is more in Woody Allen's line.

If he were writing about rampaging dinos today, though, Crichton might have to deal with just such a poultry problem. The reason: a team of paleontologists from China, Canada and the U.S. announced last week that they've discovered not one, but two new species of small dinosaur, each of which was clearly covered with feathers. According to their report, which appears in the latest issue of Nature, the specimens not only cement the increasingly popular theory that birds are descended directly from dinos. They also suggest that many kinds of dinosaur, including the vicious velociraptors that slashed their way through Crichton's fiction, may have been festooned with their own colorful plumage.

For now, all the scientists can say for sure is that these are definitely dinosaurs and that they definitely have feathers. And that alone is a big deal, as the paleontologists involved in the discovery are swift to point out. "It is," says Philip Currie, of Canada's Royal Tyrrell Museum of Paleontology and a co-author of the Nature report, "one of the most exciting discoveries of the century, if not the discovery of the century."

It is more than a century, in fact, since Darwin's friend Thomas Henry Huxley first proposed a theory, based on his observation of broad anatomical similarities, that birds might be descended from the dinosaurs. But for decades, nobody could produce much detailed physical evidence to back up the theory. It wasn't until the 1970s that Yale paleontologist John Ostrom began building a bone-by-bone case for the link--at least for theropod dinosaurs, which include velociraptors and tyrannosaurs. By the mid-1990s, the list of parts common to birds and dinos included wishbones, breastbones, three-toed feet, hollow bones and swiveling wrist joints.

That has been enough to convince most dinosaur experts, but some paleontologists who specialize in birds didn't much like the theory. Both birds and dinosaurs, they contend, evolved from some older common ancestor. Any similarities between the two groups, they say, have to do with that parentage, and also with the fact that evolution can often produce the same features, even in utterly unrelated animals. Sharks and dolphins, for example, have comparable body shapes, though one is a fish and the other a mammal. Such disparate creatures as bats, birds and butterflies all have wings in common.

But when the number of shared features reaches critical mass, scientists have to consider a direct evolutionary relationship. A dinosaur with feathers would clearly tip the scales: they're by far birds' most characteristic feature, and they had to evolve from somewhere. The skeptics have always contended that birds' ancestors were tree-dwelling lizards, and that feathers evolved to help the lizards flap their way from branch to branch. Fast-running, ground-dwelling dinos like velociraptors would never have needed feathers.

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