 There are so many abilities that were thought to be uniquely human, and then it turned out that, oh, well, you know, maybe the primates have them as well, and oh, look, they're in rats, and oh, it's not just rats, it's actually a great many vertebrates, and so on. And mental time travel is one of those where, for a long time, it was thought that only humans, you know, were able to look forward or look past, and that animals were, you know, fixed in an immutable presence.