WASHINGTON—Wildlife biologists confirmed Friday they have documented multiple sightings of endangered gray wolves in the U.S. Capitol building, marking the first time in almost a century these elusive creatures have been observed in either house of Congress. "This is an enormous step toward restoring the species to the nation's seat of legislative power, where gray wolf populations once thrived," said zoologist Ben Garret, explaining that motion-activated C-SPAN cameras had caught an entire pack passing right through the central rotunda area, and showed one of the males briefly sniffing Sen. Joseph Lieberman's shoe before rejoining the group. "Gray wolves once sat atop a complex ecological food chain in the Capitol, roaming freely through its halls, and without them, the Senate and House membership has run rampant." Senior lawmakers have called for a swift eradication of the wolves, which they blame for startling Congress's blue-ribbon heifer, Tabitha, and causing her milk to run sour.