Instinctive behavior occurs when an animal has a particular internal state while it is in the presence of a specific external stimulation called a releaser or a sign stimulus.
How many ships did the U-boats sink? During the war the U-boats sank about 2,779 ships for a total of 14.1 million tons GRT. This figure is roughly 70% of all allied shipping losses in all theatres of the war and to all hostile action. The most successful year was 1942 when over 6 million tons of shipping were sunk in the Atlantic.
U-Boat 110 destroyed ten vessels before it was sunk by the Royal Navy during July 1918. The Royal Navy managed to surface the sunken u-boat and were planning to return her to service. The u-boat which had a crew of around 41 poeople only had nine survivors when it was defeated in battle. The vessel went down off the coast of Hartlepool in the north east of England.