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.
USS Constitution, Built in 1797, The Only Active Ship In The US Navy That Has Sunk An Enemy Ship. USS Constitution fires a 17-gun salute during the ship's first turnaround cruise of 2013. The underway commemorated the 71st anniversary of the Battle of Midway and recognized first responders of the Boston Marathon bombings.