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Fig. 5. Audiograms of Grampus (blue line) and Pseudorca (red
line) along with representative spectra of on-axis clicks from each species on
a relative dB scale. Note that high ambient noise levels masked the maximum
sensitivity of the Grampus audiogram, which explains the large
difference in threshold between the two species
(Nachtigall et al.,
1995). Coloured bars signify frequency range of the centroid
frequencies of on-axis clicks from the two species recorded in the wild. The
Grampus audiogram is from Nachtigall et al.
(1995) and the
Pseudorca audiogram from Thomas et al.
(1988a).
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