An Asian elephant called Koshik has astounded scientists with his Korean language skills. Researchers report that the mammal has learnt to imitate human speech and can say five words in Korean: hello, no, sit down, lie down, and good.
From a press release:
There have been some earlier reports of vocal mimicry in both African and Asian elephants. African elephants have been known to imitate the sound of truck engines, and a male Asian elephant living in a zoo in Kazakhstan was said to produce utterances in both Russian and Kazakh, but that case was never scientifically investigated.
In the case of Koshik, Angela Stoeger, Daniel Mietchen, Tecumseh Fitch, and their colleagues confirmed that Koshik was imitating Korean words in several ways. First, they asked native Korean speakers to write down what they heard when listening to playbacks of the elephant’s sounds.
You can see a brief video here.
Although dolphins (Tursiops truncatus) have been trained to match numbers and durations of human vocal bursts  and reported to spontaneously match computer-generated whistles , spontaneous human voice mimicry has not previously been demonstrated. The first to study white whale (Delphinapterus leucas) sounds in the wild, Schevill and Lawrence  wrote that “occasionally the calls would suggest a crowd of children shouting in the distance”. Fish and Mowbary  described sound types and reviewed past descriptions of sounds from this vociferous species. At Vancouver Aquarium, Canada, keepers suggested that a white whale about 15 years of age, uttered his name “Lagosi”. Other utterances were not perceptible, being described as “garbled human voice, or Russian, or similar to Chinese” by R.L. Eaton in a self-published account in 1979. However, hitherto no acoustic recordings have shown how such sounds emulate speech and deviate from the usual calls of the species. We report here sound recordings and analysis which demonstrate spontaneous mimicry of the human voice, presumably a result of vocal learning , by a white whale.
Which animals will follow suit in this phenomenon?