Imagine traveling thousands of miles with your newborn in search of food. Now imagine doing this in almost complete darkness. This is exactly what humpback whales and their newborns do as a matter of routine. The journey to the food-rich Antarctic or Arctic waters from their tropical breeding grounds can be thousands of miles. The mother and calf swim in deep ocean waters where light is scarce and therefore vision is not very useful. The pair has to depend on sound to keep track of each other. But broadcasting their presence to killer whales can be fatal.
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