Stunning footage of a baby sea urchin has been awarded fifth place in the annual Nikon Small World in Motion video competition.

What are some animals that give birth to huge numbers of offspring at once?” (Watch a female sea urchin produce millions of eggs.) The mola, or ocean sunfish, looks like an animal cracker someone bit ...

Long-spined sea urchins have emerged as an environmental issue off Australia's far south coast. Native to temperate waters around New South Wales, the urchins have expanded their range south as oceans ...

Sea otters are North America’s smallest marine mammal, weighing just 30 to 100 pounds, but their appetites are huge. They burn calories at three times the rate expected for their size, chomping on ...

Thousands of sea urchins have mysteriously washed up dead on a French island in the Indian Ocean, leaving scientists perplexed. Around 5,000 urchins have washed up on the western side of Reunion ...

Despite recent efforts by sea urchin harvesters to reduce protections for southern sea otters under the Endangered Species Act, the species is still at risk, federal officials say. The fuzzy marine ...

Before 2013, divers on North America's west coast rarely saw purple sea urchins. The spiky animals, which are voracious kelp eaters, were a favorite food of the coast's iconic sunflower sea stars. The ...

Lacking natural predators and able to survive long after food sources are diminished, purple sea urchins are devastating kelp forests, an important carbon sink. The founders of a Newport startup have ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. The photographer identified the species as Arbacia lixula — a black sea urchin. As juveniles they ...