Someone has been searching for an image of opossum scat. Well, here you go. 'Possum scat comes in quite a few variations - depends on what the little critter's been eating. But, no matter what it's been eating, 'possum scat isn't pretty ;)
As for the fly - no clue as to genus/species. I haven't had time to look it up.
(Treebeard is currently recouperating from outpatient surgery. I am staying home from work to keep him out of trouble and to see that he mends in a timely fashion. So far, so good. He seems to be behaving himself. We will see how things progress as the week goes on...)