Don’t need a study to show coyotes prey on wounded animals unless you are an idot. They have been doing that for a few 1,000 years. They have just adjusted to being handed free meals by the lead slingers. Why would they work for their dinner when Billy the Blaster rings the dinner bell for them. Given the rapid increase in folks getting into dog tracking I wonder how many deer have been shot at because”why not , I can always call the dog man”. Maybe you could make a graph.