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Exemplary images of deer antlers: (A) overview, (B) with their specific microstructures, and (C) with their nanostructures within the microstructures. Note that ~26 micro-cavities (arrows) per mm2 (26.2 ± 1.9) could be observed with a dimension of 41.9 ± 2.4 µm, mean ± s.e.m. (FE-SEM Merlin VP compact, 5 kV, HE-SE detector; scale bars: (A) = 100 µm, (B) = 20 µm, (C) = 2 µm)).
