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Wildlife viewing is often a component of naturebased tourism activities, offering educational opportunities and generating a substantial amount of revenue (Leonard 2006). These benefits can provide incentives to promote wildlife populations in areas that might be otherwise prone to unsustainable harvesting or habitat destruction. However, wildlife viewing can also contribute to disturbance of wildlife and/or important habitats when conducted irresponsibly (Geffroy et al. 2015, Senigaglia et al. 2016). In particular, there is considerable concern about an thropogenic disturbance of already vulnerable species that are struggling with population status and recovery. Marine wildlife viewing often occurs from motorized vessels, which introduce incidental and sometimes in-

Noise levels received by endangered killer whales Orcinus orca before and after implementation of vessel regulations