EXCERPT: The whales feed near Antarctica during the summer and then migrate north to coastal waters during the winter to give birth and breed. The mothers and calves remain there for three months and often keep very close to shore, just beyond the breaking waves.
It is suspected they do this because the noise of the waves helps mask any sounds they make and thus makes it harder for predators such as killer whales and sharks to find them. The findings of Mia Nielson of Aarhus University in Denmark and colleagues suggest this is indeed the case.
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