DISCOVERY CHANNEL RANKS #1 IN IMPORTANCE TO THE ENJOYMENT OF CABLE FOR 15th CONSECUTIVE YEAR IN THE 2008 BETA RESEARCH CABLE SUBSCRIBER STUDY

--Discovery Channel is #1 in Average Perceived Value Among Comcast, Cox and Time Warner Subscribers--

(Silver Spring, Md.) � For the 15th consecutive year, Discovery Channel is #1 in importance to the enjoyment of cable, perceived value and being a favorite channel, according to today's results of the 2008 Beta Research Cable Subscriber Study � Evaluation of Basic Cable Networks. Additionally, Discovery Channel ranks #1 in virtually every other category measured, including importance to the enjoyment of cable among viewers (tied); satisfaction rating among viewers (tied); percent of viewers satisfied with the network (tied); percent of viewers rating program quality high (tied)*; and percent having viewed the network in the past year.

"Discovery Channel continues to lead all other networks in perceived value and importance to the enjoyment of cable in this year's study, which is especially important to our affiliate partners during today's challenging economic times," said Bill Goodwyn, president, Domestic Distribution and Enterprises, Discovery Communications. "We continue to invest in top-notch, best-in-class programming for our networks and the results of this study provide further proof that this commitment to quality continues to resonate with viewers."

Among Comcast, Cox and Time Warner subscribers, Discovery Channel ranks #1 for both perceived value and being a favorite channel. In other notable results, Animal Planet ranked in the top five for viewer satisfaction and program quality.

The study coincides with a period of continued audience growth for Discovery Channel and Animal Planet. For the month of November to-date vs. the same time period a year-ago,

Discovery Channel's primetime households (HH) and total viewership (P2+) delivery are up compared to the same time period last year: HHs +9%; total viewers +9%, and the network's key demos also posted delivery increases in primetime: P25-54, +8%; M25-54, +10%. Animal Planet also experienced strong gains in primetime: P18-34, +21%; W18-34, +17%; and M18-34, +22%.

About Discovery Communications

Discovery Communications (Nasdaq: DISCA, DISCB, DISCK) is the world's number one nonfiction media company reaching more than 1.5 billion cumulative subscribers in over 170 countries. Discovery empowers people to explore their world and satisfy their curiosity through 100-plus worldwide networks, led by Discovery Channel, TLC, Animal Planet, Science Channel, Planet Green, Investigation Discovery and HD Theater, as well as leading consumer and educational products and services, and a diversified portfolio of digital media services including HowStuffWorks.com. For more information, please visit www.discoverycommunications.com.

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*Rated a statistically insignificant one point below another network.