Super Bowl commercials are as popular for some viewers as the teams playing in the annual most-watched sporting event on television.

Car manufacturers to computer companies, a minute of airtime cost millions and advertisers try to outdo each with cuteness, cleverness and controversy.

For the past 30 years, there’s been one constant — the Budweiser Clydesdales.

The majestic horses first appeared in Super Bowl XX in 1986. In different plots, the Clydedales spots are annually among the game's most popular commercials and also remain atop many lists as among the game's most popular commercials in history.

The Anheuser-Busch company, the brewers of Budweiser beer, introduced the Clydesdales in 1933 to celebrate the end of Prohibition. The horses were a gift from August A. Busch, Jr. and Adolphus Busch to their father.

When Super Bowl 50 is played Sunday, February 7, the Clydesdales will be back in Budweiser commercials, but the theme of the commercial has not been revealed to the public.

Unlike many companies whose commercials for this year's games are already being viewed on YouTube, Budweiser keeps its Super Bowl commercials secret until they’re broadcast.

Clydesdales are draught horses that originated as farm horses near the River Clyde in Lanarkshire, Scotland. The Anheuser-Busch herd of 250 is one the largest in the world and it carries on the legacy of the original mating of Flemish horses with local mares.

In addition to appearing in Super Bowl commercials, the Clydesdales appear at other parades and are available for public viewing. The stable of horses are based in St. Louis, Missouri, Merrimack, New York and Fort Collins, Colorado.

Although the Clydesdale commercials are classic, last year’s offering gathered its share of controversy.

The ad featured the Clydesdales saving a golden retriever puppy from hungry wolves.

While not revealing anything further about this year’s commercial, Budweiser has announced the previously in peril dog won’t return.

Only one since the Clydesdale commercial debuted was the annual tradition in jeopardy.

Budweiser’s new parent company, Anheuser-Busch InBev, decided not to feature the horses in the 2010 Super Bowl.

A fan poll on Facebook was overwhelmingly in favor of the commercials, and the decision was reversed. The Clydesdales appeared in a fourth quarter commercial. The tradition has remain intact since.

Anheuser-Busch recently announced a new Clydesdale named Mac was born into the Missouri herd — just in time for the Big Game.

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