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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A public service announcement uses a dramatic example to emphasize that ocean fish aren’t as big as they used to be. Find out more about the decline in the ocean's top -- and often...
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Jorge and I packed up the night we arrived in Panama with Aaron O'Dea and his...
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Sirenians , or seacows, are a group of marine mammals that include manatees and...
At the ends of the Earth, life thrives despite extreme conditions. In the...

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Charles Darwin is so well known he almost needs no introduction. The 19th-century naturalist and geologist spent his life documenting and collecting...
One of the ocean's tiniest organisms often does the most harm. Microscopic...
This summer, many of you have likely enjoyed feasting on crabs, be they blue...

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Whales swim, but their ancestors walked. Whales are mammals (like us) whose ancestors lived on land. Life probably began in...