In some finch species, the difference between colorful males and muted females comes down to one gene, BCO2, which encodes an enzyme that degrades carotenoids.

Distantly related, lookalike Heliconius species arrive at the same appearance using the same few genes, but regulated differently, according to recent studies.

Scientists uncover a potential reason why redder house finches have better health.

New research shows how they get their deep hue.

Female zebra finches prefer red-beaked male finches over their orange-beaked counterparts.

Despite containing similar chemical pigments, red and yellow parrot feathers display distinct hues.

Scientists engineered biomaterials similar to those chameleons use to change color and applied them to a robot.

In an unusual evolutionary twist, local stick spiders have come up with an almost identical repertoire of color morphs in multiple locations.

Artificial photoreceptors made of nanowires help restore blind animals’ sensitivity to light.