 I want to talk about the very intelligent animals in just a moment, the elephants, the orcas, who definitely have a rich experience of mourning. I think I'm comfortable saying that. Does the data tell us anything reliable about where the line is? We kind of keep biting around the same question here. Where in the animal kingdom, even if it's a meandering line, do we draw a line between what we think might be mourning versus behaviors that aren't emotionally attached in the animal world?