Dolphins Have Astounding 'Social Memory'
Can recall whistles 20 years later
By Rob Quinn, Newser Staff
Posted Aug 7, 2013 12:22 AM CDT
Dolphins also remember their enemies, researchers found.   (AP Photo/Rob Carr)

(Newser) – Dolphins not only have names for each other, their memories are so good that they can remember the "signature whistles" of friends—and enemies—for at least 20 years, according to a new study. Researchers studied scores of captive bottlenose dolphins that had been shifted around the US and found that they responded much more readily to the sounds of dolphins they had once known—including family members, ex-tankmates, and former mates—than the calls of strangers, the BBC reports.

The dolphins' "social memory" is the longest ever recorded in the animal kingdom. Researchers believe the ability to recognize familiar whistles, which stay the same while age changes their outward appearance, helps dolphins live in "fission-fusion" societies, where they join and leave different groups many times over a lifetime. "We know they have relationships in the wild that last decades," an animal behaviorist tells Science. "Remembering a particular individual—even in the absence of that individual—could help them navigate their current social milieu."

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Aug 7, 2013 11:31 AM CDT
You expect me to believe this? How many times did these researchers whistle and get all the dolphins to come, float at attention, roll over, and play dead? How many of them speak dolphin and are communicating with them VERBALLY? Show us the proof.
Aug 7, 2013 6:34 AM CDT
"The dolphins' "social memory" is the longest ever recorded" Well, then that is only because they haven't done the same tests on elephants. Probably the only reason dogs aren't in the competition is their shorter lifespan. Of course, their memory measured in "dog years" may be longer.
Aug 7, 2013 2:55 AM CDT
"Their memories are so good that they can remember the "signature whistles" of friends—and enemies—for at least 20 years." So, their the "Elephants of Water World."