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(A) Schematic drawing of a fox snow diving, a behavior known as mousing. This schematic drawing is composed of scenes traced from the video of Creative #1150719032 (24). (B) Tracking data for the nose when an arctic fox dives into the snow. Data were obtained by analyzing the same video we traced in (A) (24). The left y-axis shows the speed, and the right y-axis shows the vertical position of the snout. Diving profiles for four other videos are provided in SI Appendix, Fig. S1.
