 Any non-venomous snake can flatten their head into a diamond shape, and they do that when they feel threatened. It's a form of mimicry. And it's true that our pit vipers have slit pupils like a cat's eyes, but their eyes work like ours. So if it's dark outside, those pupils dilate, and then they look round. And you don't want to grab a copperhead because you thought it had round eyes, and it's just dark outside. And that explains why at times, like on social media, I'll see a picture, and an expert will identify it one way or the other. And by looking at the picture, I think, well, that kind of goes against what I've been told, the shape of the head, the eyes. Yeah.