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Posted: Jul 16, 2015 11:00 PM ET
Pete Marra might describe felines as mass murderers. He's a researcher at the Smithsonian Conservation Biology Institute. And he's just released a new study on cat behaviour.
WATCH: Orphaned baby possum melts hearts in Aussie zoo
4-month-old Bettina clings to stuffed kangaroo for companionship
RAW: Violent clashes at Brazil university
Police use pepper spray to clear students occupying entrance to Pernambuco University
WATCH: Protester rushes Harper on stage during rally
2 climate change activists ejected in separate incidents
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