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Science 1 December 1995:
Vol. 270. no. 5241, p. 1436
DOI: 10.1126/science.270.5241.1436
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Research News

Joshua Fischman

The mark of a mammal is a migrating ear. A chain of small bones that used to be part of the jaw moved back to the skull and became the middle ear--a journey that set true mammals apart from every other vertebrate. A new theory argues that this mysterious transformation of jaw and ear was actually driven by a different body part: the expansion of the brain.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)