“…Aerial photogrammetry has gained increasing popularity in the studies of aquatic megafauna to estimate their size, volume, and mass, which are vital parameters to assess health and nutritional status for conservation management (e.g., blue whale, Balaenoptera musculus , by Durban et al, 2016; manta ray, Mobula alfredi , by Setyawan et al, 2022; whale sharks, Rhincodon typus , by Whitehead et al, 2022; sea turtles, Dermochelys coriacea , by Schofield et al, 2019). Many cetaceans occur in large pods, with individuals changing positions in the frame throughout a single drone flight (Cheney et al, 2022; Durban et al, 2015; Fearnbach et al, 2018; Fiori et al, 2017; Laborie et al, 2021). It is, therefore, more challenging to analyze an image containing multiple individuals and more effort is needed to identify each individual and measure each individual's morphometrics.…”