《Table 2 Run test and correlation test of inter-scan intervals and scan durations in reproductive Bl

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《Sequential vigilance is unpredictable in reproductive Black-necked Cranes》

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Significant cases were in italics.While numbers represent the group number and the letters represent the individuals from the same group

We totally included 100 vigilance sequences in our database；the average duration of inter-scan intervals was20.3±0.4 s，ranging from 1 to 331 s，whereas the average scan duration was 6.6±0.3 s，ranging from 1 to 215 s.For the instantaneous randomness，86 sequences passed Kolmogorov–Smirnov test for the negative exponential distribution，meaning that 86.0%sequences interrupted feeding and scanned their surroundings randomly.The parameters of each negative exponential function were shown in Table 1，and the grouped inter-scan intervals were shown as Fig.1.