Newborn chicks will react by fleeing for cover when a model of a hawk is drawn above them in the air. Experiments reveal that this response is completely non-specific and can be elicited by moving objects of any shape in the air. Even the chicks are three week old, they respond selectively to objects that have the shapes of birds of prey and ignore other. In an experiment, newly hatched chicks were divided into two groups: One was exposed twice a day to models of different shape and sizes and the other was reared with no exposure to such models at any points. After three weeks, both groups were tested for their responses to different shaped models. Chicks of both group showed selective avoidance responses only to model shaped like birds of prey.
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M.Sc. Entrance

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