Around 115 million years ago, northern Australia’s seas hosted a colossal shark that rewrites what we thought we knew about early ocean predators. New fossil discoveries show that modern-type sharks were experimenting with gigantic sizes far earlier than scientists believed, competing with the marine “monsters” of the dinosaur age.

An above-ground storage tank operated by Carbon California released approximately 420 gallons of crude oil into a tributary of Sisar Creek near Ojai on Wednesday.

Massive Sargassum blooms sweeping across the Caribbean and Atlantic are fueled by a powerful nutrient partnership: phosphorus pulled to the surface by equatorial upwelling and nitrogen supplied by cyanobacteria living directly on the drifting algae. Coral cores reveal that this nutrient engine has intensified over the past decade, perfectly matching surges in Sargassum growth since 2011. By ruling out older theories involving Saharan dust and river runoff, researchers uncovered a climate-driven process that shapes when and where these colossal seaweed mats form.

A once-abundant giant has nearly become a myth in the Salish Sea; researchers hope to change that.

Rog Hanson isn’t a scientist, but he’s likely spent more time with Pacific seahorses than anyone else. He built them a secret underwater city.

Ocean plastic kills sea creatures. For the first time, researchers set out to find out how much it takes. The answer: Surprisingly little.

Researchers have identified ginkgo-toothed beaked whales alive at sea for the first time after years of searching, and in doing so solved the mystery of an odd echolocation pulse in the North Pacific.

Mimmo, a bottlenose dolphin, has been delighting tourists in Venice with his acrobatic flips for months.