Horned+Viper

The horned viper, //vipera cerastes//, is highly poisonous. Viper mummies have been found at Thebes.

One of the poisonous snakes the Egyptians feared most was the horned viper (Cerastes cornutus and Cerastes cerastes, also known as the sand viper). When the horned viper attacks, it rasps its coils together before springing forward. The rasping sounds like the letter f, and the horned viper was used as the hieroglyph to write the sound (fy is the Egyptian word for "viper" as well).

Sand Viper Saw Scaled Viper, which is very dangerous, and Burton's Carpet Viper, which is found in the Sinai and apparently mole viper

The Reptiles and Amphibians of Ancient Egypt