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Temperatures measured by dataloggers at active pika sites, summer 2019 to summer 2020. North Mono Craters (2219 m; red points) and Virginia Canyon, Sierra Nevada (3182 m; 25 July 2019–12 July 2020; blue points). Maxim iButtons model 1921G, measured at 4 h intervals starting at noon. (a) Temperatures at surface of talus/lava at haypile site; (b) Temperatures within matrix of talus/lava (0.5–0.75 m below surface).
