Tyack, P.
"Run deep, but not silent
Oceanus, vol. 43, issue 2, Woods Hole, Massachusetts, World Scientific, pp. 54-56, 03/2005.
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Whales are among the most elusive animals that humans have ever hunted. Pursuing whales across the seas and centuries, whalers made careful observations of whale behavior whenever and wherever they surfaced. But sperm whales, for example, spend about 95 percent of their time beneath the waves. Studying five percent of their behavior was enough to learn how to kill them, but it has taught us very little about how they live.