Growth, Development, and Life History
Published online by Cambridge University Press: 10 July 2020
The structural similarity of chimpanzees and humans corresponds so closely that an early work on chimpanzee anatomy found it necessary to repeat the words “as in Man” 182 times in a 97-page work (see Chapter 7). Yet, this tale of similarity has a twist: To the casual observer the many micro-scale similarities between Homo and Pan are overwhelmed by undeniable macro-scale differences. Whether an expert or neophyte, one cannot fail to notice that chimpanzees have longer, thicker body hair, a jutting face, a smaller braincase, long arms – longer the closer one moves to the tips of their extraordinarily long fingers – short legs, and a very unhuman-like nose, a nose that is little more than two holes in the face. Anatomists who emphasize similarities have not overlooked these differences, but they more often drill down to the millimeter- or microscopic-scale, and here neurons, pulmonary alveoli, muscle fibers, tendons, and the arterial networks are nearly identical in chimpanzees and humans.
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