Alcatrazes Lancehead
Otherwise known as the Bothrops Alcatraz, the Alcatrazes Lancehead is a dangerous snake from the coast of Brazil. This snake is enormously rare, with only a precious few left alive, but this might assuage some Brazilian citizens. And yes, the Alcatrazes Lancehead is as dangerous as its name suggests.
Tiger Keelback
Tiger Keelback snakes are a water snake from Japan but it can be found throughout Eastern Asia. These snakes only grow to around 3 feet in length and it is very shy, which has led many people to presume that it is harmless — this is not the case. They also have the ability to consume toxic creatures, store it in their own glands, before releasing it at a later time as an extra attack.