Good memories

Dolphins remember each other for decades 

I didn't know this about dolphin "names":

Between the ages of about 4 months and a year, every bottlenose dolphin settles on a whistle of its own that stays the same for the rest of the dolphin's life. In another recent study, published last month in Proceedings of the National Academy of Sciences², Stephanie King and Vincent Janik, two marine-mammal biologists at the University of St Andrews, UK, have shown that dolphins use these whistles in the same way as humans use names: they voice their own whistles to identify themselves to others, and they mimic others’ whistles to call to them.