WALLENDA FALLS — IN THE RATINGS

Nik Wallenda didn’t fall during his two tightwire walks between Chicago skyscrapers on Sunday but his ratings certainly did. According to Discovery Channel, which televised Skyscraper Live with Nik Wallenda, the blindfolded walk — the second walk of the night, lasting two minutes — attracted 6.72 million viewers, 2.55 million of whom were in the 25-54 age group that advertisers prefer for news and information programs. The first walk, which lasted seven minutes and required Wallenda to climb a rope at a 19-degree incline, drew 5.82 million, with 2.17 million in the demo. Discovery did not disclose how many people watched the entire 2 1/2-hour telecast. By contrast, The Walking Dead, which aired opposite the tightwire act on AMC, pulled in 14.5 million viewers of whom 9.6 million were in the younger demo. (On broadcast TV, NBC’s Sunday Night Football was the most-watched program of the night with 17 million viewers.) A year ago, Wallenda’s walk across the Grand Canyon set a record for the Discovery Channel with 13 million tuning in for the actual walk and an average of 8.5 million for the entire two-hour telecast.