The Bluegrass Generals are pictured at the 2023 Free Fall Bluegrass Festival in Vail. Chris Pandolfi, center, of the Infamous Stringdusters will be performing on Sunday at this year's version of ...

Blue tits are a firm favourite of gardeners and birdwatchers alike, with their distinctive mix of blue, yellow, white and green colours making them easily identified ...

Dogs, for instance, see the world in shades of blue and yellow. Some animals, like mantis shrimp and birds, can perceive a world of color that is completely invisible to humans.