Sherry Washburn is why they recognize beyond hematology, but also within primatologist mother field of biological anthropology. Washburn did is that he was very instrumental in stressing the importance of primate studies, he essentially kind of inherited this perspective from his own advisor or a student. But it was really sherry Washburn who really propelled this field and initiated and encourage his own students to go out and expand what we know about the primates beyond what we already knew which was largely focused on the apes. He was also one of the ones that that notice that recognized early on the importance of doing fieldwork. And what we needed to understand how these animals behave in their natural environment. two separate settings in which you study animals but studying them in their native habitat really gives us a sense of what is more typical of their behavior. And that's what he really wanted to capture. social behavior and implications for understanding human origins. So urban towards the first one and actually urban devor initially started off as a student in cultural anthropology or social anthropology. And sherry Washington was able to kind of recruit him over to work with him and to travel to Kenya to study wild all of baboons and again here. The focus was trying to use these animals as models of our human ancestors. It was believed that are hominid ancestors evolved in a Savannah like environment. And of course, now our understanding of that is shifted a little bit. It's probably more like a woodland environment. But at that time. That was kind of the, the going hypothesis. And so the idea was, okay, if we want to understand human origins, we need to understand how primates are able to survive in a Savannah like habitat. So the idea was, Let's study the wild Allah baboons to better understand some of the constraints and the pressures that our own ancestors faced. As they descended from the trees and began moving about on the savanna and walking by easily. So that was his objective and how did he do it well again because he was trained as a socio cultural anthropologist, essentially what he did is he borrowed techniques from social and cultural anthropology to use in primary technology. Rich description of behavior. And so he essentially that's the method that that he used to document and make his observations about baboons and one of his key observations that he's written quite a lot about Kind of CERN's the importance of the male dominance hierarchy and what divorce noted on basis of these observations is that the male dominance hierarchy. so the ranking of males relative to one another into an hierarchical system on formed the binding force of the social system in in baboons, right, so that was one of his contributions. I should note though that this perspective has later been criticized and it's been criticized largely because One of the things I mean divorce produced a lot of amazing work and really shed light on lot of on thing that help again help propel from ontology. But one of the things that he did is that he focused so much on males and male. The male dominance hierarchy.