The Ocean Through Time

Life began in the ocean around 3.5 billion years ago and as evolution progressed, many species went extinct -- and some left behind fossils -- as others appeared. And even now, the ocean hasn't stopped changing as evolution continues and humans leave their mark.

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About 100 million years ago , during the heyday of the dinosaurs, reefs were built by mollusks called rudist clams. Like modern clams, rudists were bivalves , with two shells (or valves) joined at...
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Most people have never heard of the Hawaiian petrel , an endangered, crow-sized...
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What makes a top predator? Razor-sharp teeth? Speed? Strength? Size? Who is the...
The ocean is not as natural as it once was. Where there used to be large...

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