 I think that's exactly when they were up in their trees making a nest for the night. It was only in the heat of the day that they would be able to come down safely in order to collect food. The heat of the day, lions and leopards, they're asleep. They're underneath trees. They're trying to get shade. Whereas that's exactly when humans today are their most active. And I think that's exactly when our ancestors probably were active as well.