A hatch-year Common Raven (Corvus corax) with subcutaneous and internal pseudocysts, filled with fluid, containing a pair of adult trematodes and numerous eggs consistent with Collyriclum faba, died near a riverbank in California, US. While C. faba is incidental in many Passeriformes, this case was a fatal systemic infection.
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Vol. 53 • No. 1