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Such signals should be simple to acquire with inexpensive equipment. The beat-to-beat information embedded within the time intervals between consecutive heart beats is a non-stationary physiological signal; its potential for biometric verification has not been studied. This work introduces a biometric verification method termed \u201cCompaRR\u201d. Heartbeat was extracted from longitudinal recordings from 30 mice ranging from 6 to 24\u00a0months of age (equivalent to\u2009~\u200920\u201375 human years). Fifty heartbeats, which is close to resting human heartbeats in a minute, were sufficient for the verification task, achieving a minimal equal error rate of 0.21. When trained on 6-month-old mice and tested on unseen mice up to 18-months of age (equivalent to ~\u200950 human years), no significant change in the verification performance was noted. 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