"The greater strength of wild mice makes it impossible to subject them to some behavioral tests designed for the comparatively feeble lab mice. For instance, a standard test of muscle endurance is called the cord drop. The test is quite simple: a mouse is dangled from a taut cord by its front feet—your basic pull-up position—and scored according to how many seconds it can hang on before dropping to the ground. A robust young laboratory mouse is doing well to hang on for thirty or forty seconds. When we tried this test with our wild mice, they simply pulled themselves up onto the top of the cord and walked off. We didn’t actually see them sneer with contempt, but they may have."
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