Appendix S1 Methods and results of spectrometry.

Movies S1, S2 Positioning behaviour of H.  roboraria (S1) and J.  fuscaria (S2) after landing on tree bark.

Tables S1, S2 The statistics of the results of spectrometry analysis.

Figures S1, S2 Example of photographs used in the experiment.

Figure S3 Reflectance spectra of H.  roboraria, J.  fuscaria and background tree bark.

Figure S4, S5 The contrasts between the moth and its background for moth images and for specimens in the field (S4 for H.  roboraria, S5 for J.  fuscaria).

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