Photographs from a Trumpeter Swan (Cygnus buccinator) found dead in Indiana

Photographs from a Trumpeter Swan (Cygnus buccinator) found dead in Indiana, U.S.A.  (A) The majority of the intestinal serosa is dark red. (B) The lumen contains gelatinous dark red material and many <1 mm diameter white structures (trematodes) (arrows). (C) On the serosal surface are two 2 to 5 mm discrete ulcers (arrow). (D) On the corresponding mucosal surface is an accumulation of soft tan material (necrotic debris) (arrow).