Harmful algal bloom toxins are prevalent along the Pacific Coast of North America and may be detected in marine wildlife without deleterious effects on health. We measured concentrations of domoic acid and saxitoxin in fecal samples from free-swimming gray whales (Eschrichtius robustus) feeding on the northwest coast of Washington, USA in the summer and fall of 2018 and 2019. Concentrations in gray whale feces were compared to those measured in shellfish and to phytoplankton cell counts taken over the same time period. Photo-identification of individual whales allowed for insights about feeding location and exposure to toxins.

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