Mystery 'random event' killed off Earth's last woolly mammoths in Siberia, study claims Livescience.comFreak event probably killed last woolly mammoths, scientists say The GuardianDid inbreeding cause the woolly mammoth's extinction? Our research suggests it was more sudden than that The ConversationThe last woolly mammoths on Earth died from bad luck, not inbreeding New ScientistThe Last Stand of the Woolly Mammoths The New York Times