MIAMI (AP) - The Chicago Bears had a ready response for Brandon Marshall's taunting.
Julius Peppers and a swarming defense allowed only 187 yards and a single third-down conversion Thursday night, and the Bears won 16-0 to send the injury-ravaged Miami Dolphins to their second home shutout in 40 years.
Marshall drew an early flag for taunting when he flipped the ball at former Denver teammate Jay Cutler, standing in front of the Bears bench.
"We don't need that to fire us up," Chicago coach Lovie Smith said. "We were fired up when we stepped on the field."
Marshall also was penalized for an illegal block and dropped two passes before he left the game in the second quarter after aggravating a sore right hamstring. He wore street clothes on the sideline in the second half and didn't talk to reporters after the game.
Miami's already depleted offensive line lost center Cory Procter with a left knee injury. And with third-string quarterback Tyler Thigpen taking six sacks in his first NFL start since 2008, the Dolphins were no match for a Bears defense that took over the NFL lead in points allowed per game.
"Offensively we're embarrassed what we put on the field," Thigpen said. "I put the blame on me."
Playing in Miami for the first time since losing Super Bowl 41 to Indianapolis, the Bears (7-3) won for the third time in 12 days and moved a half-game ahead of Green Bay atop the NFC North.
The Dolphins (5-5) lost at home in prime time for the third time this season. Coach Tony Sparano declined to blame injuries for the dismal showing.
"Those are excuses," he said. "I'm not going to use them. I don't want my team to use them. This is the NFL. The next guy has to step up."
Peppers had three sacks and Charles Tillman recorded an interception for the Bears, who earned their first shutout since Nov. 19, 2006, against the Jets.
"It's nice to get a couple sacks," Peppers said. "It's even nicer to get that goose egg."
Smith had the Bears blitzing even in the final moments, when the outcome was decided.
"Coach let us keep going at the end of the game," linebacker Brian Urlacher said. "We didn't want to give up any points. Anytime you have a chance that late in the game for a shutout, you might as well try to keep it. They're really hard to get in the NFL."
The Dolphins were blanked for the first time since a 3-0 loss at Pittsburgh during their one-win season in 2007. Their only other home shutout since the first year of the Don Shula era came in 2001.
Matt Forte carried 25 times for 97 yards and a score for the Bears, who converted 10 of 18 third-down situations and controlled the ball for nearly 38 minutes. Cutler said the offense had an easy job.
"The way the defense is playing, we didn't have to do much," he said.
The Dolphins went 1 for 12 on third down, and a 46-yard kickoff return to start the game created their best scoring threat. They moved inside the Bears 35 for the first time on the game's final play.
Thigpen, pressed into duty after Chad Pennington and Chad Henne were hurt in Sunday's game, finished 17 for 29 for 187 yards, and he had 27 of the Dolphins' 39 yards rushing. But he found himself scrambling often and fell to 1-11 as an NFL starter.
"Offensively we couldn't get out of our own way," Thigpen said. "We would get one thing going, and then we'd get one thing to set us back."
Ronnie Brown and Ricky Williams combined for 11 yards rushing on six carries.