Published: Dec 04, 2012 4:01 PM EST

NEW YORK (AP) - Duck callers, pawn shop operators and zombies offer the latest evidence of how the television world has expanded.
    
CBS was the most popular television network last week with six of its programs reaching season highs in ratings. They included the comedies "2 Broke Girls" and "Mike & Molly."
    
Meanwhile, the Tru TV network had the biggest audience in its history with the sixth season premiere of "Hardcore Pawn." The reality shows "Gold Rush" on Discovery and "Duck Dynasty" on A&E also showed strength.
    
The Nielsen company said that more than 15 million viewers tuned in to one of the three airings of "Walking Dead" on AMC Sunday. The show is now going on hiatus until February.

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