Whistles in Vocal Repertoires of Bottlenose Dolphins (<i>Tursiops truncatus</i> Montagu, 1821) and Common Dolphins (<i>Delphinus delphis</i> Linnaeus, 1758)

The article is devoted to the comparative analysis of underwater sounds of two sympatric dolphin species living in the Black Sea, the Bottlenose dolphin and the Common dolphin. During processing and analysis of sounds were used a special program nanoCAD22. Both the similarity of the physical parameters of the sounds of two species and a number of specific features of whistles characteristic of each of them were shown. The phenomenon of production by Common dolphins some types of whistles that have significant similarities (sometimes almost identical) to the signature-whistles of Bottlenose dolphins was detected and analyzed.