Saharan horned viper, or horned desert viper,(Cerastes cerastes) is a venomous viper species native to the deserts of Northern Africa and parts of the Middle East. They often are easily recognised by the presence of a pair of supraocular horns, although hornless individuals do occur.
Gaboon viper (Bitis gabonica) is a venomous viper species found in the rainforests and savannas of sub-Saharan Africa. This is not only the largest member of the genus Bitis, but also the world's heaviest viperid and it has the longest fangs, up to 2 inches (5 cm), and the highest venom yield of any venomous snake.
This two headed albino milk snake was born last year in Florida. The condition, called Polycephaly, occurs when monozygotic twins fail to separate completely. Most organisms with this condition will not live for long, but occasionally you will get cases like this one, where the snake(s?) seem healthy enough and can live for years. The heads act independently of one another, and will fight over food given the opportunity.