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“In view of the frequent occurrence of modern domestic groups that do not consist of, or contain, an exclusive pair-bonded father and mother, I cannot see why anyone should insist that our ancestors were reared in monogamous nuclear families and that pair-bonding is more natural than other arrangements.”
― Marvin Harris , Our Kind: Who We Are, Where We Came From, Where We Are Going

“Every morning, the male and female [Siamang] burst into spectacular duets. [...] Since the song reflects their marriage, the more beautiful it is, the more their neighbors realize not to mess with them. A close-harmony duet communicates not only "stay out!" but also "we're one!" (p. 177)”
― Frans de Waal, Are We Smart Enough to Know How Smart Animals Are?