O.K., I admit that this is just a little over the top. Probably beyond the bounds of good taste. However, I kind of like this picture and thought I would put it in anyway.
When I took this picture, I was actually looking for something else. There is a little moth that I have seen around here that is a dead ringer for a bird dropping. Imagine going through life looking like a bird dropping. Do you think anyone would mess with you? Birds probably wouldn't, and a moth's biggest enemy is probably a bird.
Actually, there are several insects that mimic bird droppings, including the larvae of swallowtail butterflies.
I am not sure of the flies here. There are some differences in the two larger ones, which could mean that they are two different species or it could be a male and female of the same species.
Can you see the very small fly in the foreground? I am not sure what is going on here, but there are some types of flies that lay their eggs on the eggs or larvae of other insects. Their larvae then live as internal parasites on the other insects. Is this what is happening? I don't know. But that would be my guess.
I think the two larger flies will lay eggs on the dropping, and then the smaller fly will parasitize their eggs.