Many of the 167 species are largely or entirely black, but some have bright metallic coloration.

Sun Parakeets are popular as pets because of their bright coloration though they have a very limited ability to talk.

Male birds and fish of many species have brighter coloration or other external ornaments.

The Nunuli seemed to have recovered his bright gray coloration.

During this time, males develop a bright yellow coloration on their chests.

During the breeding season the fish changes color, developing bright red coloration on the lower parts.

They emphasized its overall bright blue coloration, and noted that further study could reveal it to be a distinct species.

Most adult males are eaten by birds because of their bright coloration during breeding season.

The females lack the bright coloration of the males.

Its fur is very short, and it has bright yellow coloration.