slideshow

The Ocean Throughout Geologic Time, An Image Gallery

Evidence shows that life probably began in the ocean at least 3.5 billion years...

Photo

Cambrian Period (542 – 488 Million Years Ago)

The basic body plans of all modern animals were set during the Cambrian Period, 542...

Photo

Darwin’s Evolutionary Tree Diagram

This 1837 sketch is Charles Darwin’s first diagram of an evolutionary tree. It...

Photo

Whales Returned to the Sea

Vertebrates evolved in the sea and eventually moved onto land. The ancestors of...

audio

Sea Slugs: One Species at a Time

Come one, come all! See the amazing, the astonishing, half-animal, half-plant!...

Article

Why a Tusk? The real-life unicorns of the sea and the tusks that make them famous

In the frigid Arctic Ocean, a mysterious toothed whale—the narwhal— resides...

How Do Sea Lions Swim?

A family of tourists in Canada’s Steveston Harbor recently got a treat when a...