Scientists have found that female humpback whales reunite each summer to feed, swim and socialise in the Gulf of St Lawrence, off Canada.
Though humpbacks spend the rest of the year apart migrating and breeding, it seems that individual humpbacks manage to find each other again in the open ocean each summer, spending the season feeding together.
It also seems that such friendships benefited the female humpbacks, since those with the most stable and long-lasting associations tended to give birth to the most calves. How the whales find each other each summer remains a mystery.
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