Vigilance and group size in ostriches

  title={Vigilance and group size in ostriches},
  author={B. Bertram},
  journal={Animal Behaviour},
  • B. Bertram
  • Published 1980
  • Biology
  • Animal Behaviour
  • Key MethodWild ostriches were observed while feeding alone or in groups of up to four birds, and their vigilance (proportion of time with the head up) recorded. Individual vigilance declined as group size increased, mainly through a decrease in the frequency with which the head was raised. Males were more vigilant than females, mainly because they kept their heads up for longer. Vigilance was influenced more by the presence than by the vigilance of a companion. When a head would stay down for a long time…Expand Abstract


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