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Heart rate variability (HRV) during the first week of captivity. Heart rate variability is higher during the day than at night in recent captives and after 1 month captivity. (A) Daytime HRV increases over the first week of captivity. (B) Night-time HRV increases over the course of the experiment in saline- but not propranolol- or phentolamine-treated birds. Syringes indicate days of saline, propranolol or phentolamine treatment. Points represent means ± SE.
