This video from the Cornell Lab of Ornithology in the USA says about itself:
Roboraptors and the Alarm Call Network
15 March 2016
Erick Greene and his team employ “roboraptors”—taxidermied hawks and owls with robotic moving parts— to learn about how birds communicate with alarm calls when a predator is nearby.
For more: see here.
Dear Kitty. Some blog 