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How do dark feathers and hair resist wear better than light-colored ones?
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coloration
The anole changes color in response to its stress level.
In the context of biological coloration, the increased durability of dark feathers and hair is primarily attributed to the presence of melanin.1
Melanins are complex polymers synthesized from the amino acid tyrosine. When deposited in feathers or hair, these pigments provide structural reinforcement that makes the tissues more resistant to wear and abrasion. This enhanced durability is likely why many birds possess dark, melanic wing tips and why a high proportion of birds inhabiting exceptionally abrasive environments, such as deserts, exhibit black coloration.21