A western deer mouse (Peromyscus sonoriensis) has a resting heart rate around 630 beats per minute, and it climbs to about 1,000 when the mouse is running. This page beats that many times in 60 seconds so you can feel the pace. Yours is probably beating about 70.
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0.0 s of 60 ยท 630 bpm
That was one minute of a deer mouse's heart. In the same minute, a resting human heart beats about 70 times, roughly 9 times slower.