I know that there are a lot of people that think that this should be a common courtesy or common sense but there are people that don't know that failing to do so could actually get you a ticket or worse.
Imagine you're hiking through the woods and you see something unusual. You think you know what it is but, no, it can't be that, right? A skull? Okay, maybe it is a skull but it's most certainly not human, it has to be an animal. It just has to be.