Arapaima, also known as “pirarucu” or “paiche,” are gigantic carnivorous fish that live in the Amazon and surrounding lakes. Encased in armored scales, they think nothing of living in piranha-infested waters—and they are pretty effective predators themselves, feeding on fish and the occasional bird. Arapaima tend to stay close to the surface, because they need to breathe surface air in addition to taking in oxygen through their gills, and make a distinctive coughing sound when they emerge for air. They can reach 2.7 meters (nine feet) in length and weigh up to 90 kilograms (200 lbs). These fish are so vicious that even their tongue has teeth.
Prague, capital of the Czech Republic, is bisected by the Vltava River. Nicknamed “the City of a Hundred Spires,” it's known for its Old Town Square, the heart of its historic core, with colorful baroque buildings, Gothic churches and the medieval Astronomical Clock, with a popular show. Completed in 1402, pedestrian Charles Bridge is lined with 30 statues of saints.
