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From Biology-Online Dictionary
1. Anything set up to frighten crows or other birds from cornfields; hence, anything terifying without danger. A scarecrow set to frighten fools away. (Dryden)
2. A person clad in rags and tatters. No eye hath seen such scarecrows. I'll not march with them through Coventry, that's flat. (Shak)
3. (Science: zoology) The black tern.