Blue Jay
This bird produces melanin, a black pigment, meaning that its feathers should appear black. However, tiny air sacs in the bird's feathers scatter light, making them appear blue to our eyes.
Blue Iguana
When the lizards are born, they are intricately patterned but barely blue, with only some parts of their bodies maintaining a pale blueish-gray color.
Glaucus atlanticus
Glaucus atlanticus is a bizarre-looking species of nudibranch, and just like many other nudibranchs, it is notable for its bright coloration.
Mandarin Dragonet
It is a brightly-colored fish from the Pacific Ocean that is one of only two vertebrates whose blue coloration is a result of cellular pigment rather than structural coloration.
Blue Poison Dart Frog
The frog's blue coloration warns predators that it is poisonous, a phenomenon known as aposematism, and is caused by the structure of its skin cells.
Blue Morpho
he butterfly's blue coloration is caused by the structure of its wings, which contain microscopic scales that have ridges shaped like Christmas trees with alternating thin layers known as lamellae.
Sinai Agama
Sinai agama (Pseudotrapelus sinaitus) is a species of lizard that is found in deserts throughout the Middle East. The lizard's skin is usually brown, allowing it to blend in with its environment.
Linckia laevigata
The sea star is notable for its blue coloration, which ranges from a light blue to a dark blue depending on the individual.
Carpathian Blue Slug
The Carpathian blue slug (Bielzia coerulans) is found in the Carpathian Mountains in Eastern Europe.
Blue Lobster
This coloration is caused by a genetic mutation that causes the lobster to produce an excessive amount of a particular protein that gives it that color.