Development of freezing and immobility, predator defenses, in the Bobwhite quail (Colinus virginianus).

@article{Borchelt1973DevelopmentOF,
  title={Development of freezing and immobility, predator defenses, in the Bobwhite quail (Colinus virginianus).},
  author={P. Borchelt and S. Ratner},
  journal={Behavioral biology},
  year={1973},
  volume={8 1},
  pages={
          83-92
        }
}
In two experiments freezing and immobility responses were investigated with Bobwhite quail ( Colinus virginianus ). Posttest responses were also recorded. Groups of birds were tested at 4–5, 9–10, 14–15, 19–20, and 29–30 days of age. Durations of immobility increased from 0 sec at 5 and 10 days to more than 60 sec from 15 to 30 days. Durations of freezing increased from 0 sec at 4 and 9 days to 10 sec at 29 days. Freezing was a more probable response at 9 days than immobility at 10 days… Expand
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