Changes sought to avoid Petaluma bird deaths

Environmental groups have asked Caltrans to consider construction alternatives that would not harm a protected bird species that build nests under the Petaluma River bridge.

The groups offered a litany of proposals to deal with cliff swallows, which became entangled and died in loose netting installed under the bridge during the Highway 101 widening project.

The proposals were in response to a July letter from Caltrans and the Federal Highway Administration seeking input from environmental groups. The agencies are considering whether to prepare a supplement to the project's environmental impact report, in response to the bird deaths.

The environmental groups filed a lawsuit in May seeking to require Caltrans to study the impact of the project on the cliff swallow colony. The migratory birds were not mentioned in the agency's original 2009 environmental report.

"Our plaintiffs' major concern is that if we do not learn from history, then history will repeat itself," said Danny Lutz, an attorney with the Animal Legal Defense Fund. "Last year, the cliff swallows returned to an accidental death trap. This year, it wouldn't be accidental, but one the agencies knowingly set."

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