Everybody knows how oysters make pearls-- a bit of sand or grit slips through the protective barrier of their outer shell, irritating the mollusk's body, and the invertebrate encircles the invader ...

A few weeks ago, during a trip to the Scripps Institution of Oceanography’s Birch Aquarium, I bumped into a nautilus. More or less. Admittedly there was an aquarium pane and many gallons of water ...

After the End-Permian extinction 250 million years ago, ammonoids diversified and recovered 10 to 30 times faster than previous estimates. The surprising discovery raises questions about ...

Although ammonoids died out around the same time as most dinosaurs, new computer models are revealing how these marine animals moved through the water. Nobu Tamura via Wikicommons under CC BY 3.0 ...