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One of the first physical signs of the wolf project at Yellowstone National Park will appear this month when workers build pens for the brief confinement of transplanted wolves.

Yellowstone is expected to receive wolves this fall in the drive to re-establish the animals in the park.For several weeks, transplanted wolves will be kept in one-acre pens in Yellowstone's northern area, the National Park Service said. The goal is to acclimate the animals before releasing them.

The opening of bids from fence contractors is scheduled for Wednesday.

Federal agencies plan to move all or parts of three Canadian wolf litters to the park, and they also want to transplant the mothers to Yellowstone. The reintroduction project has brought protests from people who say potential problems include the wolves roaming out of the park, and attacking livestock.

"We're planning on proceeding," said Wayne Brewster, a Park Service official working on the project.

Federal agencies say they will move forward unless a federal judge orders them to stop. Last week, Farm Bureau officials in Montana, Idaho and Wyoming announced they would file a lawsuit in an attempt to block the reintroduction.

Plans call for areas surrounding the pens to be closed after wolves arrive, the Park Service said. Guards are to be stationed 24 hours a day until the wolves are released.