How woodcocks produce the most brilliant white plumage patches among the birds

Jamie Dunning, Anvay Patil, Liliana D'Alba, Alexander L. Bond, Gerben Debruyn, Ali Dhinojwala, Matthew Shawkey, Lukas Jenni

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Until recently, and when compared with diurnal birds that use contrasting plumage patches and complex feather structures to convey visual information, communication in nocturnal and crepuscular species was considered to follow acoustic and chemical channels. However, many birds that are active in low-light environments have evolved intensely white plumage patches within otherwise inconspicuous plumages. We used spectrophotometry, electron microscopy, and optical modelling to explain the mechanisms producing bright white tail feather tips of the Eurasian woodcock Scolopax rusticola. Their diffuse reflectance was approximately 30% higher than any previously measured feather. This intense reflectance is the result of incoherent light scattering from a disordered nanostructure composed of keratin and air within the barb rami. In addition, the flattening, thickening and arrangement of those barbs create a Venetian-blind-like macrostructure that enhances the surface area for light reflection. We suggest that the woodcocks have evolved these bright white feather patches for long-range visual communication in dimly lit environments.

Original languageEnglish
Article number20220920
JournalJournal of the Royal Society Interface
Volume20
Issue number200
DOIs
Publication statusPublished - 1 Mar 2023

Keywords

  • electron microscopy
  • finite-difference time-domain modelling
  • reflectance
  • Scolopax
  • spectrophotometry
  • visual communication

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