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What makes it family friendly, in this case, is that a bunch of people's families liked it. It was a reader poll. I have three kids (two boys, one girl) with very different interests and ages, and anything that will keep the attention of all of them AND my husband and me is practically a miracle.
Three of the films on the list meet that description, though: Born Free, The Black Stallion and Microcosmos.
To the person who asked about Pixar: I believe the original request specifically said no computer animation. I was hoping Andrew would make an exception for the "Walking with Dinosaurs" series, but no dice. I still recommend it very highly (though paleontology purists would undoubtedly disagree - but they're good stories, and we know they're meant to be speculative; that's the ENTIRE point, in fact).