The nanonetworks in bird feathers have been replicated in a material that could be used in batteries and water filters.
Biophotonics of diversely coloured peacock tail feathers - Faraday
New Nanonetwork Material Replicates the Structure of Bird Feathers
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The structure of feathers Biomimicry architecture, Architecture
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Replicating the structure of bird feathers - The new material
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Microstructural architecture of feathers makes them tough