From red to white to orange to blue, fish flesh can land almost anywhere on the color spectrum. What's behind this huge variation? A lot of things — from genetics to bile pigments. And parsing the ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Far beneath the ...

You can see right through this little aquarium fish from Thailand: Its skin is almost completely transparent. But when the light hits it just right, its body flickers with shimmering rainbow colors.

If you ever travel to the Maldives, you might be able to see a rainbow without any rain. Meet the newly discovered rainbow-colored fish named the rose-veiled fairy wrasse in the Maldives' "twilight ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. NEW YORK (AP) — You can see right through ...

A rainbow-colored fish that’s considered among the world’s most beautiful in freshwater and found only in picturesque Appalachian streams has been listed as “endangered,” the U.S. Fish and Wildlife ...

First introduced in The Rainbow Fish in 1992, the title character, who finds happiness when he learns to share his iridescent scales, endeared himself to children and adults alike. Written and ...