Thelma Elizabeth Rowell (1935–2024) was a British biologist and zoologist known mostly for her work with monkeys and sheep. She was a professor of zoology at the University of California, Berkeley from 1974 to 1994. Rowell was known for her field research on Olive baboons in Uganda. Her work challenged the then-prevailing assumptions about baboon society and the "army model" that centered the role of male aggression and hierarchy. She was a key thinker in pushing primatology toward abandoning the idea of a single "primate pattern," which purported to characterize social behaviors across different species and locations. Instead, throughout her career, she emphasized the complexity of animal behavior and the pitfalls of sweeping generalizations. Among her peers in primatology, Rowell was known as an iconoclast who challenged anthropocentric assumptions about animal behavior. Her contemporaries coined the term "Thelma Effect" to refer to thinking that challenged dogma in their field. Rowell's work was widely appreciated by feminists, but she eschewed identifying or being seen as supporting any particular ideology.
Biography Thelma Elisabeth Giles was born in Yorkshire, England, in 1935. She attended Newnham College, Cambridge, as a zoology undergrad. She continued her studies at the University of Cambridge, studying hamsters for her dissertation and working in the lab of Robert Hinde. (Hinde later advised Jane Goodall, and credited Rowell, along with Goodall and Dian Fossey, with changing his perspective on his work.) As part of this experimental work, Rowell temporarily removed mothers of rhesus macaque infants and tested their stress responses. She wrote up the findings and submitted them to the Zoological Society of London Journal under the name "T.E. Rowell." The paper was well-received, but when the journal invited its author down to London to give a talk, the realization that Rowell was a woman came as an unwelcome surprise. The Society told her that she would not be able to eat with the fellows due to her sex and needed to sit behind a curtain, out of sight, to eat her meal in private. Rowell declined and, in the words of a biographer, “shared a pork shop at a girlfriend’s flat instead.” When her macaque study ended, Rowell found that she was unable to break Cambridge’s "old-boy network" and concluded she had no shot at a university position.) While at Cambridge, she had met Hugh Rowell, a fellow zoologist and grad student, and the two married at the Queens College chapel, each receiving their zoology doctorates on the same day in 1959. Hugh Rowell was offered a position as a university lecturer at Makerere University in Uganda, and the couple moved to Africa in 1962. Rowell decided to apply for a grant to conduct primate field research, an easier inroad to academic work for women at the time, and received a grant from the British government. The focus of Rowell's research was to compare and contrast the behavior of wild and caged olive baboons. She began a six-year study in 1963 in a forested area of Queen Elizabeth Park, several hours away from Makerer University in Kampala. She traveled back and forth every two weeks, alternating between observing baboons in the field and studying caged baboons at the university.
Challenging the baboon model Baboons are unusual among monkeys in that they are largely terrestrial — most monkeys live in trees. Anthropologists viewed baboon social groupings as primitive models of human society. American anthropologists Sherwood Washburn and Irven DeVore had conducted early research on baboons, and, building on 1930s work by Solly Zuckerman, defined the outlines of baboon societies that Rowell had studied at Cambridge. Males were seen as constituting the core of social groupings, keeping others in line through aggression and a strict dominance hierarchy. Washburn viewed this portrait of baboon life as the "primate pattern," a model he believed varied little across contexts and species. Rowell saw a different picture. Her baboon males were not very aggressive; in fact, fights were rare enough that she didn’t see any sign of a clear male hierarchy in the wild. Males tended to transfer in and out of her group, whereas the females stayed put. The females grouped themselves along kinship ties and determined the group’s feeding path for the day. Rowell found the claims of an "army model" for baboon behavior puzzling. Males were said to lead groups and protect the females and infants from predators. But whenever she observed predators approaching, the males — rather than fighting them off — were the first to flee, leaving the females and infants behind as easy prey. Rowell published her findings in the Journal of Zoology (1966). Wary of contradicting her predecessors, she suggested that the behavioral differences she observed may have something to do with her group's (unusual) forest habitat in Uganda. Previous baboon studies focused on savanna baboons — perhaps the environment explained the differences? She later came to regret this bit of "professional diplomacy," as it flowered into a myth about the "arcane forest baboon" that took years to undo. Rowell's second paper about baboons, "A Quantitative Comparison of the Behaviour of a Wild and Caged Baboon Group" (1967), became a classic in ethology; it was selected for a 1996 Nature volume, Foundations of Animal Behavior, along with 33 other papers by scientists such as Charles Darwin, John B. Watson, and E.O. Wilson.
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