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Here off the coast of San Juan Island, the whales’ voices were like fine silk stitched into a thick denim of propeller and motor sound, clicks and whistles sometimes audible but often disappearing into the tight weave of engines. Whales cannot hear the echolocating pulses that locate their prey, breeding fish cannot find one another amid the noise and turbidity, and the social connections among crustaceans are weakened as their chemical messages and sonic thrums are lost in a haze of human pollution. We are severing the sensory links that gave the world its animal diversity. Industrial chemicals befuddle the sense of smell of aquatic animals. Sediments from human activities on land cloud the water. Today, ocean waters are a tumult of engine noise, sonar and seismic blasts.
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These sonic bonds not only connect the members of each pod, but distinguish the pod from others. When the pod is more widely spaced during searches for food, the whales whistle less and communicate with bursts of shorter sound pulses. These whistles are the sounds of whale conviviality, given most often when the animals are socialising at close range. Mixed with the staccato of the whales’ clicks were whistles and high squeaks, sounds that undulate, dart, inflect up and spiral down. The whales use the echoes not only to see through the murky water, but to understand how soft, taut, fast or tremulous matter is around them. These sounds are the whales’ echolocating search beams. Clicks, like taps on a metal can, came in squalls. Whale sounds! And engine noise, lots of engine noise. We dropped a hydrophone over the boat’s gunwale, its cord feeding a small speaker in a plastic casing.
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Our engines purred as the U-shaped arc of boats tracked the pod, leaving open water ahead of the whales. The L pod continued west, heading toward the Haro Strait. Others – “transients” that ply coastal waters and “offshores” that feed mostly in the Pacific – also visit regularly. Part of the L pod of orcas, our captain said, one of three pods that form the “southern residents” in the waters of the Salish Sea between Seattle and Vancouver, often seen hunting salmon around the San Juan Islands. The pod of about 10 animals came to the surface. Praaf! Surfacing 15 metres ahead of the boat, the exhalation was plosive and rough. A spill of black ink sheeting under the hazed bottle glass of the water’s surface. A sheet of marble skated just under the water’s surface.