A relatively small set of colour patterns — spots, stripes, bands, countershading, eyespots and iridescent shifts among them — recur across many unrelated animal groups, generally because they serve one or more well-documented functions such as camouflage, warning display or signalling, even though the exact purpose is not always established for every individual case.
Stripes and spots are among the most widespread animal colour patterns, occurring independently across mammals, fish, birds, reptiles and insects, most commonly linked to camouflage or disruptive colouration rather than one single shared function.
Animals · confidence: high
Eyespots — circular markings resembling a large eye — occur across butterflies, fish and some amphibians, and are generally understood to startle or misdirect predators, though the precise mechanism varies by species.
Insects · confidence: medium
Sexual dimorphism in colour — where males and females of a species differ visibly — is well documented across birds, butterflies and some reptiles, and is commonly linked to mate attraction and mate choice.
Animals · confidence: high
The same pattern type can serve different functions in different species — stripes provide disruptive camouflage in a tiger but function as a bold warning signal in a wasp — so pattern alone does not determine purpose without species-specific context.
Animals · confidence: medium
A calibration note against assuming one universal function for any given pattern type.
Frequency and rarity claims above are scoped to a specific domain, geography or taxonomic group — none are presented as a single universal ranking. See methodology.