During the First World War, the position of Great Britain was not the easiest, including at sea. The hardest thing in this respect for the British was in a collision with German submarines, which went on to the so-called "unrestricted naval war". And here ordinary sea gulls, which had one extremely useful habit, came to the rescue of the British.
During the First World War, Germany was one of the leading countries in the number of combat submarines. More importantly, the German navy was perhaps the most efficient in this area. With the escalation of the conflict on land, the aggravation of the conflict at sea took place. The more difficult the position of the German Empire became, the more desperate the battle was led by its fleet. Starting with pinpoint raider operations, when submarines attack only military targets, the Germans moved to unlimited naval war - they simply began to sink all ships of the Entente countries, including those that are not the military.
By 1917, the situation at sea for the British was very difficult, despite the fact that Germany was clearly gradually weakening. The submarines of the Germans brought enormous problems to both the combat and merchant fleets of the Entente. The only problem was that with the then development of technology, it was extremely problematic to detect submarines.
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It is for this reason that a bold project for the use of gulls was proposed in the naval department. The military suggested that the tendency of seagulls to sit on anything that comes out of the water can play into their hands. The British hoped that they would be able to train the birds to land on the raised periscopes of the submarines. This was to facilitate the search and subsequent destruction of German submarines. Especially for this, many beaches in the United Kingdom were ordered to put carved out of wood periscopes, painted black. Surprisingly, the seagulls did land on them. True, it did not work out to "train" the birds to search for submarines in the sea.
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A source: https://novate.ru/blogs/120720/55271/