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An adult male Eurasian eagle owl (Bubo bubo) housed at a wildlife rehabilitation facility in southern Oregon died after a short period of progressive ill-thrift. Radiographs taken prior to death demonstrated abnormal radiopaque material in the coelom and the owl was submitted for postmortem examination. Black pigmented fungus was noted grossly, particularly in the respiratory tissues, with abundant oxalate crystal deposition associated with and without hyphal elements subsequently observed histologically. Aspergillus section Nigri was cultured from the lesions. Although there have been a few reports of aspergillosis caused by Aspergillus niger in avian species, the severity and wide tissue distribution of oxalates in this case are highly unusual.

Aspergillus Section Nigri-Associated Calcium Oxalate Crystals in an Eurasian Eagle Owl (Bubo bubo)