File:Darwin - The various contrivances by which orchids are fertilized by insects (1877) - Fig 31.png
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![File:Darwin - The various contrivances by which orchids are fertilized by insects (1877) - Fig 31.png](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f2/Darwin_-_The_various_contrivances_by_which_orchids_are_fertilized_by_insects_%281877%29_-_Fig_31.png/675px-Darwin_-_The_various_contrivances_by_which_orchids_are_fertilized_by_insects_%281877%29_-_Fig_31.png?20200529172818)
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