ocr: He said that, yes, we were right. The noise in the Yangtze was a major problem for the dolphins, and severely intertered with their echolocation. The dolphins' habit had always been, when they heard a boat, to make a long dive, change direction underwater, swim under the boat and surtace behind it. Now, when they are under the boat, theyget contused and surtace too soon, right under the propellers.
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