A recent study shows that dolphins can remember each other's
whistles after spending years apart. The
dolphin's whistle is used not only for communication but also for
identification. Each dolphin has a
unique whistle that is similar to the uniqueness of the human voice.
The dolphin's memory of sound blows other animals' memory
spans out of the water.
Monkeys can
remember things for four years and elephants 10; however, neither species can
remember things based on sound alone.
It's likely that dolphins' great sound memories have specific
purposes:
- To identify dolphins they approach in a group
setting
- To avoid dolphins that they remember as being
aggressive
Another study has shown that dolphins may copy each other's signature whistles from time to time. It's not known why they do this, but copying typically occurs between mothers and calves or pairs of captive male dolphins. The study indicates that the unique whistle
serves as a dolphin's "name" to other dolphins.
Species like whales, elephants, and parrots do have relatively long memory spans. It seems like animals that live in groups use memories to manage their social networks (not Facebook - real-life interactions). Some even use their memories and higher thinking abilities to manipulate or trick one another. Dolphins seem to be pretty honest; at least, one of the sources indicated they don't engage in deceptive behavior on purpose!
Allie and Bailey
Two dolphins, Allie and Bailey, lived together at the Dolphin Connection in the Florida Keys. They were eventually sent to separate facilities. Twenty years later Bailey showed recognition after hearing Allie's whistle played over a speaker. Bailey approached the speaker and the dolphin whistled its own signature whistle.
The experiment was repeated with over 40 other dolphins. They heard a total of 1,200 recordings of dolphins they didn't know or ones they had previously known. The dolphins ignored the unknown whistles and approached the speakers and sometimes whistled back when they recognized an old "friend."
Resources:
Dolphins
by Name
Dolphins
Have Longest Memories in Animal Kingdom
Dolphin
Memory May Be Even Better Than Elephants
Long
Time, No See: Dolphins Remember Long-Lost Buddies for Decades
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