Mozu was born without hands or feet in a free-ranging troop in Japan. Mozu could not climb. Still, the other members of Mozu's troop did not move in the trees above her at a pace that would leave her behind, despite their ability to do so. They seemed cognizant — and also tolerant — of Mozu's handicap. Primatologist Frans de Waal claims that such observations help inform us that some moral sentiments seem rooted in human ancestry.

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