Figure 1.

Philippine tarsier and its auditory and acoustic capabilities. (a) Tarsius syrichta in its natural habitat, Mindanao, Philippines. (b) Representative ABR waveform series for 45 kHz stimuli. (c) Average audiogram and standard error of six individuals; the high-frequency limit was extrapolated from the thresholds at 45 and 64 kHz. (d) Spectrogram of vocalization shows the call duration (approx. 650 ms) and dominant frequency (approx. 70 kHz); signal intensity is represented by the density of the red–black scale (hear electronic supplementary material, sound file S1, available online).