Jararaca is the common name of venomous pit vipers belonging to the genus Bothrops family Viperidae. Named as Lanceheads, American lanceheads, American lance-headed vipers. Venomous snakes are very common in Brazil. It has a very large variation on the skin, the action of the poison, and other features. These snakes range from small, never growing to more than 50-70 cm, to large at over 200 cm in length.  Most species are nocturnal, although a few that are found at higher altitudes are active during the day. Most are terrestrial, even though all are capable of climbing. Bothrops is a genus of venomous pit vipers found in Central and South America. The generic name is derived from the Greek words bothros and ops that mean “pit” and “eye” or “face”; an allusion to the heat-sensitive loreal pit organs. Members of this genus are responsible for more human deaths in the Americas than any other group of venomous snakes. Currently, 32 species are recognized. Some species:

* Jararaca-da-seca, Bothrops erythromelas
* Jararaca-do-norte, Bothrops atrox
* Jararaca-verde, Bothrops bilineatus
* Jararaca-pintada, Bothrops pauloensis
* Jararaca-da-mata, Bothrops jararaca
* Cotiara, Bothrops cotiara
* Jararaca-ilhoa, Bothrops insularis
* Jararacuçu, Bothrops jararacussu
* Jararaca-cruzeira, Bothrops neuwiedi
* Jararaca rabo-de-osso, Bothrops neuwiedi pauloensis
* Jararaca Muriciensis, Bothrops muriciensis
* Urutu, Bothrops alternatus