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(a) An example of a desired aerial photograph of a humpback whale captured by an unmanned aerial vehicle. The whale is lying flat at the surface, dorsal side facing up, with a straight body axis and peduncle (nonarching). (b) Position of measurement sites of humpback whales proposed by Christiansen et al. (2016). For clarity, only width (W) measurement sites located at 10% increments along the body axis are shown. Image replicated from Christiansen et al. (2016)
