Bottlenose dolphins can remember each other's signature whistles for more than 20 years, a study said on Wednesday- the longest social memory ever observed in an animal. Elephants have long been credited with the animal kingdom's most prodigious memory, but evidence for that was anecdotal, said the study's author Jason Bruck of the University of Chicago's Institute for Mind and Biology. Bruck claims to have compiled the first study showing social recognition in an animal persisting beyond two decades possibly "the longest pure memory of any king in a non-human species."

Dolphins remember friends' whistles for decades - study. (2013, August 8). The Manila Times, p. A6.