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When female chimps become baby killers

On Feb. 3, 2006, six females from an African chimpanzee community attacked a female from outside their group that was holding a 1-week-old infant. Bloodied and screaming, the outsider tried to flee. The attackers, five carrying their own infants, caught her and pounded on her back. Three adult males from the community tried unsuccessfully to break up the assault. After about 10 minutes, the attackers grabbed the outsider's infant. One of them delivered a fatal bite to the helpless animal's head and neck.

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