Dolphins can recognize their old tank mates’ whistles after being separated for more than 20 years — the longest social memory ever recorded for a non-human species.
The remarkable memory feat is another indication that dolphins have a level of cognitive sophistication comparable to only a few other species, including humans, chimpanzees and elephants. Dolphins’ talent for social recognition may be even more long-lasting than facial recognition among humans, since human faces change over time but the signature whistle that identifies a dolphin remains stable over many decades. (read more)
(Credit: Jim Schulz/Chicago Zoological Society)