Effects of apparent size and speed on the response of chickens, Gallus gallus, to computer-generated simulations of aerial predators

@article{Evans1993EffectsOA,
  title={Effects of apparent size and speed on the response of chickens, Gallus gallus, to computer-generated simulations of aerial predators},
  author={Christopher S. Evans and Joseph M. Macedonia and Peter R. Marler},
  journal={Animal Behaviour},
  year={1993},
  volume={46},
  pages={1-11}
}
Abstract Abstract. Male chickens, Gallus gallus , produce aerial alarm calls in response to a broad range of stimuli moving overhead, including both predators and innocuous objects. Computer-generated animations of raptor-shaped images were presented on an overhead video monitor to explore the stimulus characteristics necessary for eliciting both aerial alarm calls and non-vocal anti-predator behaviour (e.g. crouching and visual fixation). In experiment 1, apparent size (angle subtended at the… 
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