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Fig. 2 | BMC Biology

Fig. 2

From: A novel theory of Asian elephant high-frequency squeak production

Fig. 2

Facial movements (f, 55 years) during squeak production and the corresponding narrowband spectrogram: a Mouth relaxed and slightly open in resting position, b mouth closing in preparation of squeak production, c mouth fully closed and labial angles retracted at squeak onset, d,e cheeks depressed successively during squeak production, and f mouth relaxed again. Pictures were extracted from the video Additional file 1, where more subjects can be viewed squeaking

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