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.
The U.S. Navy's LCS: The Ship That Won't Sink. The Littoral Combat Ship (LCS) is like the cat with nine lives. It has survived more near-death experiences than just about any other Navy program in modern times. First there was the problem with trying to build a military vessel based on commercial standards.