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HoraceGreenley Those features include a long-term pair relationship (marriage), coexistence of economically cooperating pairs within a shared communal territory, provision of parental care by fathers as well as by mothers,
Pair bonding is not rare in the animal world or even among primates. Cooperating within a shared communal territory is not rare in the animal world. provision of parental care by fathers as well as by mothers is not rare in the animal world. Sex for pleasure is not rare in the animal world.
As i said, Humans have a few strategies and they overlap with strategies found in other mammals, especially primates. None of the human strategies or behaviors is unique; rarity comes when you do the whole Venn diagram.
Heck, if you really want uniqueness, add in hairlessness and molar count and maybe you can get there. But no strategy or behavior is by itself unique to humans.