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23 years of predation data from Yellowstone Park (U.S.A.) shows that when large prey (e.g., elk) become scarce, cougars switch to smaller prey (e.g., deer) to reduce kleptoparasitism by wolves and bears.
Summary: https://phys.org/news/2025-04-prey-size-plays-role-competition.html
Original paper: https://www.nature.com/articles/s42003-025-07779-5
("Kleptoparasitism" seems like a good word to describe the actions of billionaire oligarchs.)
Phys.org · Prey size plays surprising role in competition among wolves, bears and cougars