An elephant in a South Korean zoo uses his trunk to pick up not only food, but also human vocabulary.

An international team of scientists confirmed Friday what the Everland Zoo has been saying for years: Their 5.5-ton tusker Koshik has an unusual and possibly unprecedented talent.

The 22-year-old Asian elephant can reproduce five Korean words by tucking his trunk inside his mouth to modulate sound, the scientists said in a joint paper published online in Current Biology. They said he may have started imitating human speech because he was lonely.

Koshik can reproduce "annyeong" (hello), "anja" (sit down), "aniya" (no), "nuwo" (lie down) and "joa" (good), the paper says.

One of the researchers said there is no conclusive evidence that Koshik understands the sounds he makes, although the elephant does respond to words like "anja."

Koshik is very good with vowels, with a rate of similarity of 67 percent, the researchers said. For consonants he scores 21 percent.

Researchers said the clearest scientific evidence that Koshik is deliberately imitating human speech is that the sound frequency of his words matches that of his trainers.

Vocal imitation of other species has been found in mockingbirds, parrots and mynahs. But the paper says Koshik's case represents "a wholly novel method of vocal production" because he uses his trunk to reproduce human speech.

AP