Phonemic comparative analysis of vowel (i) of the Russian language was carried out in pronunciation of nine budgerigars and humans (three men, five women, and three children under eleven years old). A complex device "KAPROS-01" was used as an analyzer. The contact signals of the same individuals was also analyzed. Transposition of the main tone and formants in the frequency range by 2 kHz upwards and adjacency of the main tone harmonics to the first formant area are the main distinctions of the three-dimensional (3D) graph between bird and human. The bird's signal does not differ practically from the human signal according to the number of formants (two to three). The length of vowel (i) in budgerigars averages 19% of the total word length, versus 29% in humans. The main voice frequency in budgerigars in their contact signals varies from 2.2 to 3.4 kHz and, in imitations, from 2.3 to 3.0 kHz.
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