  
The Scarecrow invokes a memorable and unpleasant form of deterrence through a combination of sudden unexpected noise, movement and water spray to surprise birds, humans, and other animals. This unpleasant experience is quickly associated with the location and promotes the pest to avoid the area. While humans flee several steps after activating a Scarecrow motion activated sprinkler, animals are scared away to a higher degree, run away further and stay away longer.
Training/repelling is consistent at the location, 24 hours a day
It is the environment rather than a person or other animal doing the 'conditioning'
The water spray distributed is sufficiently surprising and unpleasant to communicate an immediate 'Leave now' message
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