Some of the world’s most fascinating creatures live underwater. And unlike the more mainstream animals under the sea — ...

The sea creature is bright blue and can swell up like ... and is native to the Western Pacific. These jellyfish are clear or brown-tinted and are usually the size of a beach ball.

Sea slugs use bold, bright colors under sunlight to warn predators of their toxic traits. These colors are easier for fish to ...

The 15-year-old California sea lion joins a select group of animals that together upended the long-held idea that the ability ...

Picture an ocean world so deep and dark it feels like another planet – where creatures glow and life survives under crushing pressure. This is the midwater zone, a hidden ecosystem that begins 200 ...

Sea creatures were spotted in California waters ... company saw the “perfect combination” of Risso’s dolphins and clear water, according to a Facebook post by the group.

Though once thought to be siphonophores — colonies of specialized zooids — the velella velella is now classified as a single ...

Scientists are closer than ever to deciphering sperm whale communication. Their breakthroughs could open the door to expanded ...