Systemic Collyriclum faba (Trematoda: Collyriclidae) Infection in a Wild Common Raven ( Corvus corax ).

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.