Hansen, BK, Fultz, AL, Hopper, LM, and Ross, SR. An evaluation of video cameras for collecting observational data on sanctuary-housed chimpanzees (Pan troglodytes). Zoo Biology.
Hansen, BK, and Mitani, JC. Aggression varies with parity in wild female chimpanzees. International Journal of Primatology.
Hansen, BK, Fultz, AL, Hopper, LM, and Ross, SR. Sanctuary chimpanzees (Pan troglodytes) behave differently during public programs, but not in a manner indicative of compromised welfare. Journal of Applied Animal Welfare Science.
Hansen, BK. Primiparous and multiparous female chimpanzees differ in patterns of intrasexual affiliation.