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.
Japan: Navy: 1998: 64: Marine Corps: 109: Army: 233: Civilian: 48 . Personnel Wounded: Navy: 710: Unknown: Marine Corps: 69: Army: 364: Civilian: 35 . Ships: Sunk or beached * 12: 5: Damaged: 9 . Aircraft: Destroyed: 164: 29: Damaged: 159: 74 *All U.S. ships, except the USS Arizona, the USS Utah, and the USS Oklahoma, were salvaged and later saw action. *Figures are subject to change according to new evidence.