Eocene evolution of whale hearing

@article{Nummela2004EoceneEO,
  title={Eocene evolution of whale hearing},
  author={Sirpa Nummela and J. G. M. Thewissen and Sunil Bajpai and S. Taseer Hussain and Kishor Kumar},
  journal={Nature},
  year={2004},
  volume={430},
  pages={776-778}
}
The origin of whales (order Cetacea) is one of the best-documented examples of macroevolutionary change in vertebrates. As the earliest whales became obligately marine, all of their organ systems adapted to the new environment. The fossil record indicates that this evolutionary transition took less than 15 million years, and that different organ systems followed different evolutionary trajectories. Here we document the evolutionary changes that took place in the sound transmission mechanism of… 

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