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Great apes form best friends the same way humans do — researchers tracking chimps and bonobos found tight inner circles inside wider grooming networks
Chimpanzees and bonobos maintain tight inner circles of preferred grooming partners inside their wider social networks, ...
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Kissing, one of humanity's most universal symbols of affection, has a surprisingly primal origin, according to a new study. Researchers suggest that kissing evolved from grooming behaviors in great ...
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