Misty mountains reflect blue.

Snowy forests turn blue in morning light.

Thick ice are usually not white, but deep blue.

When asked "what is blue," "the ocean" might be the first thing to come to your mind.

The ocean looks blue because red, orange and yellow (long wavelength light) are absorbed more strongly by water than blue (short wavelength light).

So when light from the sun enters the ocean, it is mostly the blue that gets reflected. That's the same reason the sky is blue.

Blue sea anemones are home to clown fish.

A regal blue tang. The little blue fish appears in the popular movie Finding Nemo, as Nemo's forgetful friend Dory.

The poison dart frog uses its vibrant blue color as a warning.

Many reptiles have blue scales,

...including snakes, lizards and anoles.

The spix's macaw has become one of the most famous blue birds, thanks to the cartoon movie Rio.

And there are other blue birds:

the mountain bluebird,

some species of humming birds,

and the king fisher.