Picture yourself at a noisy bar. You realize that you have been shouting at your date all night in order to be heard. Well, orcas in Puget Sound are in kind of the same situation.
Marla Holt, a research biologist with NOAA's Northwest Fisheries Science Center, has found that loud boat noise forces endangered orcas to raise the volume of their calls.
But the question, Holt says, is "so what? What are the biological consequences of them doing this?”