Other examples include: 1  Some mating dances, commonly carried out by birds, are examples of fixed action patterns. 2  In these cases, the sign stimulus is typically the presence of the opposite sex. 3  Kelp gull chicks are stimulated by a red spot on the mother's beak to peck at the spot, which induces regurgitation.
Norwegian's 13-ship fleet sails all over the world, with 2015 itineraries lasting anywhere from one to 45 days. The cruise line's most popular routes include Hawaii, Alaska and the Caribbean, with home ports in U.S. cities like Honolulu, Los Angeles, Miami, New York and Seattle.
The United States Navy is a powerhouse. The fleet consists of roughly 430 ships in active service or reserve. The vessels run the gamut from the massive Nimitz-class aircraft carrier, which stretches more than 1,000 feet, to the Los Angeles-class submarine that slithers 900 feet below the ocean surface.