Some animals are so unusual that they barely look real, and transparent creatures are among the strangest of them all. These ...

Barreleye fish are named for their unique, barrel-shaped eyes. These eyes can rotate, allowing the fish to look both upward and straight ahead. Their eyes also have bright green lenses protected ...

A shiny is a very rare Pokémon that comes in a different color than usual. It may be a fictional concept, but nature has no ...

Nudibranchs such as Chromodoris annae stand out for their vibrant colors and varied shapes. (SirWat/iStock/Getty Images) ...

Scientists reveal how nudibranchs create dazzling colors through microscopic crystals, unlocking a surprising marine mystery.

A broadclub cuttlefish, the second largest cuttlefish species, blends into the ocean floor. Nick Hobgood via Wikimedia Commons under CC BY-SA 3.0 Cuttlefish are known deceivers. The sea creatures can ...

Beneath the ocean's surface lies a world of perpetual darkness, home to some of Earth's most bizarre and fascinating creatures. These deep-sea inhabitants have evolved extraordinary adaptations to ...

Hordes of bright blue, jellyfish-like sea creatures are washing up on beaches across California. As of Monday, thousands of the critters — called velella velella or by-the-wind sailors — have been ...