VIPER VARIETY is a term used to describe two species of venomous snakes, the ASP and the URUTU. The ASP, or Vipera aspis, is a species of viper found in Europe and North Africa. It is a relatively small snake, usually growing to a maximum length of about 1 meter. The URUTU, or Bothrops alternatus, is a species of pit viper found in South America. It is a larger snake, typically reaching lengths of up to 2 meters. Both species are highly venomous and should be avoided.