Figure 7.

Morphology and microstructure of prenotched rabbit skin and polar bear hairs

(A) i) Photograph of prenotched rabbit skin under uniaxial tensile loading, scale bar is 10 mm; ii) SEM image showing the disordered arrangement of curved collagen fibers in skin, scale bar is 50 μm; iii)collagen fibrils at notched side are delaminated, aligning close to the tension direction after loading (with arrow indicating the loading direction), scale bar is 1 μm; iv) collagen fibrils at unnotched side are delaminated/relaxed after loading/unloading, scale bar is 2 μm. Adapted under the terms and conditions of CC BY license. Yang et al. (2015). Copyright 2015, The Authors. Published by Springer Nature.

(B) i) Photograph of a polar bear; ii, iii) SEM images showing the hollow core and aligned shell of a polar bear hair, respectively. Adapted with permission from Cui et al. (2018). Copyright 2018, Wiley-VCH.