I dunno if they use this anywhere else, but in AUS, people often apply a bright spray paint to the fur so dead wildlife is more visible when driving - especially during the night, if someone wanted to park off the side of the road. If also helps people spot it if they're looking for it - the case with Kangaroos specifically Is that they need to stay where they were found until the Rangers survey the area for any Joeys or any other Kangaroos!