 But we often overlook how good we can be to each other as well. And one thing that you mentioned sort of in passing is that these were slow, these creatures. And walking on two legs has some serious disadvantages. Like you cannot outrun a lion or a cheetah. You're toast if you get into a foot race there. That's right. Again, an argument for why walking upright, bipedalism, doesn't seem like such a great idea.