Whales’ ultrasonic hearing has surprisingly ancient history, fossilized ear shows

All living toothed whales rely upon echoes of their own calls to navigate and hunt underwater, a skill that works best in conjunction with high-frequency hearing. Now, researchers who studied one of the best-preserved ears of any ancient whale ever discovered find that whales’ high-frequency hearing abilities arose earlier than anticipated.
Paleontology News — ScienceDaily

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