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 Navy ship count could hit 274 ships in FY 2015 (using the original Battle Force ship count rules). 13 Due to topline budget pressures, the Navy is proposing to decommission one aircraft carrier and 10 frigates, though Congress has yet to finalize whether or not the Navy will be able to retire these ships. 14 Should sequestration occur in FY 2016 and following years, the Battle Force ship count will continue to decrease, potentially falling as low as 255 by FY 2020. 15