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Whale watchers warned: Don’t eye pod closely

In September we brought you the story of the mighty blue whales, showing up in record numbers to the delight of just about everyone who could snag a peek. The whales are still putting on quite a show. Now, biologists are worried people and whales could be hurt if a few things don't change. NBC's Miguel Almaguer previews tonight’s story on NBC Nightly News with Brian Williams.