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According to Lusitania (1972):
Inglefield's other brain child was to attempt to train seagulls to defecate on periscopes, and for a short while a remote corner of Poole harbour in Dorset was littered with dummy periscopes and hopefully incontinent seagulls.
"Inglefield" means Admiral Frederick Inglefield.
Another 1972 book, The killing time: the U-...
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