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The BBC version narrated by David Attenborough is phenomenal! He is an actual naturalist and add superb commentary.
Then there is this embarrasing enterprise, dubbed by Oprah Winfrey, who absolutely dumbs it down to "short bus to school" levels. "Roar! Here comes the lion!" Are you kidding me? Rent the David Attenborough version and don't waste your time.
You should be embarassed, Oprah!
Most American studios are going to do everything they can to make money. Usually, this means making it palatable to as many people as possible by dumbing it down and attaching a big celebrity. They probably chose Oprah because she's launching a new channel with Discovery.