Figure 1. Phylogenetic tree of the analysed taxa of Caniformia (Mammalia: Carnivora). The circles illustrate how the taxa are grouped for their habitat: green = terrestrial, blue = semi-aquatic, and their phylogenetic affiliation: full circle = Pinnipedia/Ursidae, empty circle = Musteloidea/ Lutrinae + Canidae in this study. The headphone sign indicates the presence of hearing information via audiograms from the literature (see details in the Supporting Information, Table S1). The discussed origin of pinnipeds is marked by question marks and the presumed origin of a secondary return to the habitat of water with water wave symbols.