Ultrasonic hearing and echolocation in the earliest toothed whales.

  title={Ultrasonic hearing and echolocation in the earliest toothed whales.},
  author={Travis Park and Erich M. G. Fitzgerald and Alistair R Evans},
  journal={Biology letters},
  volume={12 4}
The evolution of biosonar (production of high-frequency sound and reception of its echo) was a key innovation of toothed whales and dolphins (Odontoceti) that facilitated phylogenetic diversification and rise to ecological predominance. Yet exactly when high-frequency hearing first evolved in odontocete history remains a fundamental question in cetacean biology. Here, we show that archaic odontocetes had a cochlea specialized for sensing high-frequency sound, as exemplified by an Oligocene… CONTINUE READING
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