The world's last passenger pigeons perished a century ago.

But a Santa Cruz-based research project could send them flocking into the skies again, using genetic engineering to restore the once-abundant species and chart a revival for other long-gone creatures.

The promise and peril of "resurrection biology" -- which could bring back other long-gone species such as the woolly mammoth and Tasmanian tiger but runs the risk of undermining conservation efforts -- was the topic for experts who gathered Friday at Stanford's Center for Law and the Biosciences.

"The grand goal is to bring the passenger pigeon back to life," said researcher Ben Novak of Revive and Restore, supported by entrepreneur Stewart Brand's Long Now Foundation of San Francisco and conducted at the University of California, Santa Cruz. "We're at the baby step of stage one."

After studying old and damaged gene fragments of 70 dead passenger pigeons in the lab of UCSC Professor Beth Shapiro, the team will assemble -- in computers -- the genetic code of the bird once hunted to extinction. They hope to complete that within a year.

Within two years, they plan to synthesize the actual DNA code, using commercially available nucleotides. This material will be inserted into the embryo of the passenger pigeon's closest living relative, a band tail pigeon.

Then there will be new challenges, she said.

"We need to turn it into a creature. We have to raise a captive breeding herd. Then there is

Passenger pigeons once numbered in the billions, blackening the skies and inspiring naturalists like John James Audubon, John Muir and Aldo Leopold. However, they had vanished by the first World War, victims of hunting and habitat loss.

But resurrected flocks reintroduced into a modern environment could be an invasive species, noted Andrew Torrance of the University of Kansas Law School. They also would be genetically modified organisms, subject to federal regulation.

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Researchers' plan to revive extinct species raises hopes

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