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

Take a look at the incredible barreleye fish and learn why they have a transparent forehead and glowing green eyes.

Sea slugs, such as Elysia chlorotica, are small marine creatures that produce energy from sunlight - just like plants.

Scientists have revealed footage of a colossal squid swimming in the deep ocean. It's the first time we've seen one alive in ...

At night, like many other animals that live in the twilight zone, it migrates to more shallow waters in search of food. Each night it reaches the upper layer of the ocean, or sunlight zone where ...

below the ocean surface and sustains life across our planet. It includes the twilight zone and the midnight zone, where strange and delicate animals thrive in the near absence of sunlight.