DAILY MAIL : MALE BOTTLENOSE DOLPHINS HOLD GRUDGES Lots of pop ups so I hope you have a pop up blocker.
EXCERPT: The study also found that dolphins co-operate with others that have not helped them directly, but have helped dolphins they know - suggesting the animals remember who is and isn't likely to assist them.
Dolphins are able to identify each other's calls because they develop signature whistles which stay the same throughout their life.
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