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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Most people have never heard of the Hawaiian petrel , an endangered, crow-sized seabird that spends the majority of its life searching for food over the North Pacific Ocean. Nevertheless, this bird is no...
Timeline MORE STORIES Timeline MORE AUDIO / VIDEO
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...
Slideshow MORE STORIES Slideshow MORE AUDIO / VIDEO
Evidence shows that life probably began in the ocean at least 3.5 billion years...

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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...

DIVE DEEPER

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