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.
A woman told the Associated Press that four of those killed slept in the same room as her son, who had repeatedly dived into the flood trying to save them. 1  Seven U.S. sailors went missing after a U.S. Navy destroyer collided with a Philippine-flagged merchant ship off the coast of Japan on June 17.