Family Viperidae is a group of venomous snakes that can be found across the globe. Commonly known as vipers, these reptiles are characterized by their long, hollow fangs and their ability to deliver powerful venom. Some other terms used to refer to this family of snakes include pit vipers, due to their heat-sensing pits located between their eyes and nostrils, and adders, which are common in Europe and Africa. Other synonyms that may be used include true vipers, Old World vipers and New World vipers, depending on their geographic location. Despite their dangerous reputation, vipers are an important part of the ecosystem and are respected for their role in controlling small mammal populations.