The carry-select adder generally consists of ripple carry adders and a multiplexer. Another pavilion contains terrarium containing mambas, spitting cobras, puff adders and other venomous Kenyan snakes. Typically only FPGAs contain more complex embedded functions such as adders, multipliers, memory, and serializer/deserializers. In Africa, it is mambas, Egyptian cobras, puff adders, and carpet vipers. In Africa, the most dangerous species include black mambas, puff adders, and carpet vipers. Several reptiles are also mentioned, such as adders, other snakes, and lizards. Snakes, such as common adders, may also rob the nest. However, death adders, like other snakes, perceive ground vibrations. By combining multiple carry-lookahead adders, even larger adders can be created. Death adders possess the longest fangs of any Australian snake. Two of the floating point units are adders, and two are multiply-adders. Common death adders eat small mammals and birds as a primary diet. Some Dinka people respect African puff adders. It is built using binary adders. The first two full adders would add the first two bits together.