Correlations of behavioural variables in common voles. Latency and activity measured in the open-field-test and barrier-test (n = 492 individuals) in different seasons. In the open-field-test we measured both the latency (s) to leave the secure wall of the test arena and activity level (no. of 10 s intervals were animal was active). In the barrier-test we measured the latency (s) until first crossing of barrier into unknown compartment and activity level (crossings per minute).