Scientists have seen a significant upswing in the number of pregnant female humpback whales in the Antarctic recently. Blubber samples over a six year period showed approximately 60 percent of females had high progesterone levels, an indication that they were pregnant. The scientists also have seen an increase in the number of calves born in recent years. Both signs are encouraging as humpback whales are at ten percent of their population from pre-whaling years.

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