This ethereal "sea angel" looks like CGI alien, but is, in fact, a sea slug that's had its "foot" turned into wing-like appendages by evolution.

These “butterflies of the ocean” are beautiful, deadly, and strange. 1. THERE ARE MORE THAN 3000 SPECIES. Bernard Picton, Wikimedia Commons // CC BY-SA 4.0 The bizarre, beautiful sea slugs ...

It turns out getting beheaded doesn’t mean automatic death for every animal. Researchers discovered that two species of sea slugs, Elysia cf. marginata and Elysia atroviridis, can regrow their ...

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 ...

The blue dragon sea slug. Glaucus atlanticus - also known as the sea swallow, blue angel or blue dragon - looks especially unusual.The cerata of this species are not on its back but positioned like ...

The underwater slug, which propels itself to swim by closing its hood like a jelly, also contains “colorful internal organs in between.” It lives at depths up to 13,100 feet on the sea floor ...

Why it's awesome: This tiny sea creature, which grows up to 1.2 inches (3 centimeters) long, is a type of nudibranch, or sea slug. Also known as a sea swallow or blue angel, it has three sets of ...

According to Oceana.org, Blue Sea Dragons go by other names like sea swallow or blue angel and can grow to about 1.3 inches. 12 OF THE OCEAN'S CREEPIEST CREATURES THAT ARE SURE TO MAKE YOUR SKIN CRAWL ...