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.
Publisher. A+E Networks. A massive explosion of unknown origin sinks the battleship USS Maine in Cubaâs Havana harbor, killing 260 of the fewer than 400 American crew members aboard. One of the first American battleships, the Maine weighed more than 6,000 tons and was built at a cost of more than $2 million.