What colors and feather patterns can cuckoos have?

Cuckoos exhibit a variety of colors and feather patterns, though most species are characterized by relatively subdued tones.12

Colors and Patterns

• General Coloration: The majority of cuckoos are colored in drab grays and browns. However, many species also feature patches of white or rufous (reddish) coloration.12
• Glossy Cuckoos: Members of the genus Chrysococcyx are notable for their partially or largely shining emerald green plumage.12
• Iridescence: Some tropical cuckoos possess strongly iridescent bluish plumage on their wings and backs. Other species may display brilliant purples or bright yellow.12
• Feather Patterns: Cuckoos typically have loose-webbed feathers. A common feature across most species is a long, graduated tail, where the individual feathers are usually tipped with white.2134

While many cuckoos are generally uniform in their drab appearance, these variations in color and pattern—ranging from cryptic browns and grays to striking iridescence—help define the diverse members of the order Cuculiformes.12