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Science News, March 1, 2008 by Matthew Kabrisky, Sid Perkins
Regarding "Whales Drink Sounds: Hearing may use an ancient path" (SN: 2/9/08, p. 84), I have heard that whales evolved millions of years ago into their present form, including their very large brains. We humans must be relatively recent in terms of our brain structures. Are there data concerning evolutionary development in whales?
MATTHEW KABRISKY, DAYTON, OHIO
"Learning to Listen: How some vertebrates evolved biological sonar" (SN: 5/14/05, p. 314) reviews the evolutionary steps in echolocation development in whales.--SID PERKINS
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