Two species of sea slugs can escape death and regrow entire organs like the heart and kidneys.

The bizarre, beautiful sea slugs called nudibranchs can be found in marine environments all over the world. Like orchids, nudibranchs vary widely in color and arrangement.

At first glance, the lettuce sea slug (Elysia crispata) looks like a leafy underwater alien. But what’s hiding inside its frilly green body is far more fascinating than its salad-like appearance.

Blue sea slugs were believed to prey on the Portuguese man-of-war, which contains highly poisonous nematocysts, and uses the nematocysts for defense by incorporating them into the tips of its lateral ...

They had to sea it to believe it. Researchers near California waters found an elusive, deep sea “mystery” mollusk that operates as a Venus fly trap far below depth. The creature is also ...

Apparently the mysterious creature is called the sea swallow, the blue angel, the blue dragon or the blue sea slug (if you’re nasty).

Nudibranchs steal stinging cells from other animals and use them to defend themselves. Discover the colourful world of sea slugs and their amazing abilities.

It floats upside down for better camouflage: The sea slug's bright blue coloring blends in with the surface of the water from above while its silvery-gray back looks like the sky from below.

The rare rainbow sea slug, or Babakina anadoni, is typically found in the warmer waters off Spain, Portugal and France.

The sea angel is a sea slug… but one that took a rather different evolutionary path. The sea angel appears to ‘fly’ through the water.

A new species of sea slug has been discovered off the waters of the U.K. Researchers with Centre for the Environment, Food and Aquaculture Science said they originally thought it was a well-known ...