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They travel from Antarctica to Tahiti, can sound like laughing monkeys, or barking dogs, and some were triggered by the December 2004 tsunami: they are the eerie songs made by some of Antarctica's largest icebergs.
The phenomenon occurs when the huge lumps of ice scrape past each other and produce thousands of tiny "icequakes". These are so similar to earthquakes, researchers say, that icebergs could help to better understand and predict tremors.
Massive tabular icebergs break off the Antarctic ice shelf about every 50 years. Soon after the last "calving" event in 2000, unusual harmonic tremors were picked up by underwater hydrophones as far as Tahiti.