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Walter Cronkite looks at how the discovery of a fossilised feather has led palaeontologists to believe that birds are the direct descendants of dinosaurs. Discusses the various theories on why the larger dinosaurs died out, and why mammals flourished.
This film was first broadcast: 22 Sep 1991
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Explore Our World and watch some of the most successful nature documentary series about the environment and the wonders and dangers nature has to offer. We will be posting some of the longest-running and most successful nature documentary series, revealing the trials and tribulations of life on Earth and often for the first time, the secrets of the natural world in all its wonder.
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