Abstract
1. 1. Biotelemetry transmitters were surgically implanted in the abdominal cavity of two eastern grey squirrels, Sciurus carolinesis and one eastern fox squirrel, S. niger. Heart rate response to fear was investigated by recording heart rate before, during and after a frightening stimulus. Squirrels were tested in the laboratory and free ranging under natural conditions. 2. 2. Laboratory results showed a mean bradycardia of −25%., in grey squirrels (when they had a box to retreat into) and fear tachycardia (+160%) for the fox squirrel. 3. 3. Field results clearly showed a marked fear bradycardia for both species if suitable cover was available for hiding. Over-stimulation, or lack of cover, resulted in fleeing and tachycardia.
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