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August 06, 2011
Study author Dr Shermin de Silva from the University of Pennsylvania said: ‘Elephants are able to track one another over large distances by calling to each other and using their sense of smell.
‘So the “herd” of elephants one sees at any given time is often only a fragment of a much larger social group.
‘Our work shows that they are able recognize their friends and renew these bonds even after being apart for a long time.’